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Blue organic light-emitting diodes (OLEDs) have gained tremendous attraction owing to their promising potential for flat-panel display technologies and lighting application. To make the OLEDs more useful, efficient materials are highly desired. Herein, two novel multifunctional sky-blue emitters, TPE-m-PCzI and TPE-m-TPAI, have been developed with the integration of imidazole, carbazole, triphenyl amine and tetraphenylethene groups. These materials show high photoluminescence quantum yields. Aggregation-induced emission (AIE) behavior, thermal stability and glass transition temperatures of these materials are also examined. Non-doped OLEDs fabricated employing these materials as emitters exhibit sky-blue electroluminescence and demonstrate high efficiencies of 2.22% (4.56 cd/A, 3.15 lm/W) and 3.1% (5.74 cd/A, 3.31 lm/W) for TPE-m-PCzI and TPE-m-TPAI. High performance of TPE-m-TPAI based device shows a bright prospect of imidazole and AIEgen integration to prepare efficient fluorescent materials for OLED devices. [ABSTRACT FROM AUTHOR]

In order to increase the out-coupling efficiency of organic light emitting diodes, conical Si oxide nanostructures were formed on a glass substrate using nanoimprint lithography with hydrogen silsesquioxane. Then, the substrate was planarized with TiO 2 nanoparticles. Since TiO 2 nanoparticles have a higher refractive index than Si oxide, the surface of substrate is physically flat, but optically undulated in a manner that enables optical scattering and suppression of total internal reflection. Subsequently, OLEDs formed on a substrate with nanostructured Si oxide and a TiO 2 planarization layer exhibit a 25% increase in out-coupling efficiency by suppressing total internal reflection. [ABSTRACT FROM AUTHOR]

The research of materials and structures for the manufacture of organic diodes emitting white light WOLEDS has been very intense nowadays mainly due to the possibilities of its use in obtaining low-energy light consuming. The energy transfer between polymer materials has proven to be a great allied to search organic devices with emitting white light. Polymers such as PFO-DMP (donor) and P3HT (acceptor) are candidates for this application. In this work, P3HT, PFO-DMP and blends (PFO-DMP:P3HT (5%)) films were deposited by spin-coating on digital textile printing substrates. The optical properties of the digital textile printing, polymers and blend were studied by UV-VIS, steady-state photoluminescence (PL), PL quantum yield (PLQY) and Raman (all at 298 K) spectroscopy techniques. The digital textile printing were acquired from Isoliner, a Brazilian company specialized in this kind of textile. In the blend a strongly energy transfer from PFO-DMP to P3HT was observed. The PL spectrum of the PFO-DMP:P3HT (5%) covers the 430–730 nm range. From integrated PL spectra in the range of 13–643 K, it was obtained the temperature at which the phosphor loses 50% of its initial emission intensity, T 1/2 = 430 K. Gaussian fits were performed, and the peaks were identified. Raman measurements were performed on substrates with and without polymers deposited and the results are in agreement with those found in the literature. Vibrational modes of textile increase the full width half maximum (FWHM), due to electron-phonons interaction. Results obtained through the coordinate calculation CIE from blend emission for various types of textile digital printing tested, showed the more appropriate combinations (substrate/blend) for emission in white. [ABSTRACT FROM AUTHOR]

Healthy light has attracted increasing attentions due to recognizing the hazards that modern light has caused to physiology, human eyes, ecology, and artworks. Hence, studies concentrated on the design and fabrication of hazard-free lighting sources has been significantly increasing. However, issues on light quality and energy-saving are of great importance. Here, we present an original approach to enable the generation of human-eye-friendly and melatonin suppression-less healthy light with high light-quality and energy-saving characters. Taking a three-band organic light-emitting diode (OLED) for example, the suppression threat can be reduced by 83% as the color temperature of the resulting light is decreased from 6000 to 2000 K, while slightly sacrificing its theoretical efficacy limit from 260 to 245 lm/W and spectrum resemblance index (SRI) from 90 to 83. Notably, a comparatively more healthy light can be obtained by incorporating lesser deep-blue and -red emissions even at the same color temperature. The same approach can also apply to other lighting technologies such as light-emitting diode. [ABSTRACT FROM AUTHOR]

Inkjet printing, traditionally used in graphics, has been widely investigated as a valuable tool in the preparation of functional surfaces and devices. This review focuses on the use of inkjet printing technology for the manufacturing of different optical elements and photonic devices. The presented overview mainly surveys work done in the fabrication of micro-optical components such as microlenses, waveguides and integrated lasers; the manufacturing of large area light emitting diodes displays, liquid crystal displays and solar cells; as well as the preparation of liquid crystal and colloidal crystal based photonic devices working as lasers or optical sensors. Special emphasis is placed on reviewing the materials employed as well as in the relevance of inkjet in the manufacturing of the different devices showing in each of the revised technologies, main achievements, applications and challenges. [ABSTRACT FROM AUTHOR]

Carbon-based organic conjugated materials, such as conjugated polymers, graphene, fullerenes are wildly used in the fabrication of organic light-emitting diodes, organic solar cells, organic field-effect transistors and lithium sulfur batteries, because of their advantages in terms of the tunable band gap, low-cost, simple fabrication, light-weight and flexibility. Electronic and chemical structures at metal/organic and organic/organic interfaces are the key factors that strongly influence the performance of these photoelectric devices. Therefore, it's urgently needed to deeply understand the relationship between the interfacial structure and the performance of the devices involved. This will guide us to design rational interfaces to fabricate devices with higher efficiency and performances. In this paper, we investigate the multiple attribute decision making (MADM) problems for evaluating the performances of the photoelectric devices with hesitant fuzzy linguistic Information. Then, a model based on the hesitant fuzzy linguistic weighted geometric (HFLWG) operator to evaluate the performances of the photoelectric devices is presented. Finally, an illustrative example for evaluating the performances of the photoelectric devices is given to verify the developed approach and to demonstrate its practicality and effectiveness. [ABSTRACT FROM AUTHOR]

This paper proposes a low-voltage, segmented digital-to-analog converter (DAC) for active matrix organic light emitting diode (AMOLED) display. The reference voltage of each resistor string is reduced to a value within low-voltage range in this DAC so that low-voltage transistors can be adopted in the switch arrays and buffers to replace the middle-voltage transistors, leading to the saving of the DAC's area. This structure consists of piecewise linear resistors and a SC-voltage adder, which already exist in a peripheral compensation system of AMOLED. The simulation result of the proposed DAC shows that the DNL and INL are within ± 0.5 LSB, and 64.28% of the switch area has been saved by adopting low-voltage transistors. [ABSTRACT FROM AUTHOR]

A 13.3-inch 8k4k 120-Hz 12-bit OLED display was constructed using top-gate self-align c-axis aligned crystalline oxide semiconductor FETs in the backplane. Additionally, a 12-bit source driver IC employing a digital-to-analog convertor was fabricated. [ABSTRACT FROM AUTHOR]

A prototype of an 8.34 inch, 1058 ppi 8K4K display is fabricated. This display shall use top-gate self-aligned-type crystalline oxide semiconductor field-effect transistors as the backplane, and will be the smallest 8K display in the world. [ABSTRACT FROM AUTHOR]

We have developed a transmissive organic light-emitting diode (OLED) and a reflective liquid crystal (LC) hybrid display (TR-Hybrid display). The TR-Hybrid display serves as a reflective liquid crystal display (LCD) under external light and as an OLED display in dark environments. It exhibited superior visibility and low power consumption. [ABSTRACT FROM AUTHOR]

We have fabricated transparent inverted organic light-emitting diodes (OLEDs) using a metal mesh embedded conductive film (MEF) with a non-metal transparent conductor and a novel vacuum lamination method. The device with the proposed electrode exhibits higher transmittance, lower reflectance, and especially much more stable optical properties than those of the conventional OLEDs with thin metal top electrodes over an entire visible region. Moreover, lower driving voltage is also achieved due to the embedded metal mesh. We demonstrate its potential as a reliable transparent top electrode in various optoelectronic devices. [ABSTRACT FROM AUTHOR]

A flexible vertically stacked flexible polychromatic color-tunable OLED has been developed by means of low resistive intermediate electrode technology. The polychromatic OLED has a capability to show 16 million colors with 105% National Television Committee Standard (NTSC) color reproduction. The device can produce arbitrary shape with arbitrary colors, suitable for artistic expressions, just as many as those used in information displays. Independently controlled red, green, and blue light-emitting layers are stacked vertically. With conventional indium tin oxide technology, because of the temperature restriction, it was quite difficult to achieve low resistance on plastic substrate. The reported numbers were all more than 80 Ω/□. According to the surface mobility control using Fick's law analysis, low sheet resistance 7.34 Ω/□ on plastic film was developed. At first, flexible 7.17 cm2 transparent OLED was fabricated for the performance confirmation of transparent electrode. And then polychromatic color-tunable OLED with the same size were successfully fabricated on plastic. With optical length optimization for each color stack of polychromatic OLED, more than 100% color reproduction in National Television Committee Standard was achieved by stack design. The polychromatic device can be used for colored illumination, as well as for organic-light-emitting display pixels for three times emission than conventional pixel design. The device is fabricated on plastic substrate so that the polychromatic organic-light-emitting-diode device is manufacturable with roll-to-roll production line. [ABSTRACT FROM AUTHOR]

The efficacy of drug plans can critically depend on patient’s adherence to a prescribed intake schedule. Detection of the rupture of blisters in drug packages through circuits printed on the package allows medical practitioners to monitor patient’s compliance. In the current state of the art, each blister is overprinted with a conductive track and their rupture is detected by a dedicated pin in a reusable integrated circuit (IC) that records and communicates the results. In this paper, we are reporting on the development of a smart drug package based on the multiplexed detection of printed resistive tracks monitored by an IC with a reduced number of pins, which lowers the cost and the complexity of components and assembly. Using a generalized formalism, it is shown how manufacturing tolerances limit the achievable multiplexing factor. Tests with our chosen screen printing technique allow us to conclude that a factor of 3 is achievable. This was verified by the design and the fabrication of a multiplexed 28-blister package and corresponding interrogation system. A detailed analysis reveals the limits of the technique and points to factors that may reduce variability, and the robustness of the technique is demonstrated by environmental and mechanical tests. This technique is shown to be a viable way of reducing the complexity of integration of printed and conventional electronics. [ABSTRACT FROM AUTHOR]

We studied the effects of interface morphology and phase transition on the performance of Copper Phthalocyanine (CuPc) organic light emitting diodes (OLEDs) due to thermal preparation of CuPc. CuPc thin films were used as hole injection layers for these OLEDs. The most common polymorphs are the metastable α-phase and the stable β-phase for CuPc films. The current–voltage–luminance performance of OLEDs is affected by different grain organization in the CuPc layer. We examined the changes in the phase state, the surface morphology and roughness by using a UV–vis spectroscope, a scanning electron microscope, and an atomic force microscope. [ABSTRACT FROM AUTHOR]

Efficient hole transport materials based on novel fused methoxynaphthyl phenanthrimidazole core structure were synthesised and characterized. Their device performances in phosphorescent organic light emitting diodes were investigated. The high thermal stability in combination with the reversible oxidation process made promising candidates as hole-transporting materials for organic light-emitting devices. Highly efficient Alq-based organic light emitting devices have been developed using phenanthrimidazoles as functional layers between NPB [4,4-bis( N-(1-naphthyl)- N-phenylamino)biphenyl] and Alq [tris(8-hydroxyquinoline)aluminium] layers. Using the device of ITO/NPB/ 4/Alq/LiF/Al, a maximum luminous efficiency of 5.99 cd A was obtained with a maximum brightness of 40,623 cd m and a power efficiency of 5.25 lm W. [ABSTRACT FROM AUTHOR]

The non-doped ultra-thin emissive layer (EML) is a promising novel structure for fabricating organic light-emitting diodes (OLEDs). We attempt to perform exciton management in order to obtain a highly efficient and balanced light-emitting phosphorescent red–green–blue (RGB) white OLED (WOLED). These studies include optimization of the locations of the three RGB EMLs based on investigations concerning the spatial distribution of excitons, along with the energy transfer mechanisms between different materials. More importantly, by introducing a 1,1-bis((di-4-tolylamino)phenyl) cyclohexane (TAPC) interlayer, which acts as a hole-trapping layer, a redistribution of excitons is realized, giving rise to a more balanced white light emission. This simple method is an efficient way to adjust the exciton distribution, and could therefore be used in future OLED devices. [ABSTRACT FROM AUTHOR]

A reliable evaluation method applicable to flexible OLEDs is developed to quantify water penetration from an adhesive edge face. The adhesive's apparent water diffusion coefficient obtained by this method provides the water penetration time and elucidates the pathway. Moreover, the proposed method can predict the start time of degradation. [ABSTRACT FROM AUTHOR]

The most preferred monitor gamma value of an OLED transparent display was investigated by simulating the transparent images under the real room lighting condition. It is found that the preferred monitor gamma values tend to decrease as the luminance of black point of the transparent display increases. [ABSTRACT FROM AUTHOR]

In this paper, we describe a promising way to realize highly efficient fluorescent OLEDs (Organic Light Emitting Diodes) via thermally activated delayed fluorescence (TADF) mechanism. The resultant TADF OLEDs with optimized host-dopant system showed comparable device performances and surpassed the limits of conventional fluorescent OLEDs. [ABSTRACT FROM AUTHOR]

The aim of this study is to do a psycho-visual comparison of different kinds of sub-pixel arrangements for OLED displays using low-resolution photomasks. The experimental results show that if the resolution of photomasks of OLEDs matches the active matrix, quad RGGB outperforms all others. If the maximum resolution of OLED photomasks can be 2/3 of the active matrix, size-varied quad RGGB is a good choice. If the resolution of photomasks is only 1/2 to the active matrix, double-pixel quad RGGB is preferable. Spatial sharpening also can significantly enhance the visual resolution and overall image quality. [ABSTRACT FROM AUTHOR]

A new sky-blue phosphorescent material with silyl-substituted ligand has been developed. Then, we utilize the double-emission-layers (DELs) concept to fabricate the blue PHOLED device. The DELs comprises two different host materials with higher triplet excited state. We successfully improve the high-efficienct blue OLED which has up to 47.3 lm/W at practical brightness of 1000 cd/m2. By using the efficient yellow phosphor PO-01 complex, the white OLED displayed a high current efficiency of 68.8 lm/W and at practical brightness of 1000 cd/m2 . [ABSTRACT FROM AUTHOR]

Blue phosphorescent organic light-emitting diodes (PhOLEDs) was successfully fabricated by using newly imidazole-based host doped with bis [2-(4',6'-difluoro)phenylpyridinato- N,C2']iridium(III) picolinate with 57.24 cd/A, 50.42 lm/W and 25.67 % in external quantum efficiency. [ABSTRACT FROM AUTHOR]

In this report we discuss the development of blue OLEDs employing tetradentate platinum complexes. We will discuss the development of a wide range of efficient, blue-emitting Pt complexes enabling OLEDs with record purity blue emission of (0.15, 0.08), external quantum efficiencies exceeding 25%, or blue OLEDs with operational lifetimes of over 2000h. [ABSTRACT FROM AUTHOR]

This paper investigates experimentally the mechanical reliability of AMOLED flexible display for the purpose of building feasible design concept for flexible products in the future. Three mechanical tests have been implemented respectively to investigate the mechanical strain limits of functional thin films, the electrical properties of TFT, and the mechanical reliability under bending process. Firstly, we find the tensile-strain limit is strongly related to the total thickness of consecutive brittle inorganic layers such as silicon nitride film. Secondly, the mobility of the TFT made of LTPS increases as the channel is parallel to the bending direction whereas decreases as the channel is perpendicular to the bending direction. Besides, the threshold voltage is nearly unchanged during the bending test. Thirdly, the AMOLED panel and TFT can survive after 1000,000 times of bending cycles, the AMOLED panel is not damaged under compressive strain up to −0.36%. [ABSTRACT FROM AUTHOR]

Air-stable OLEDs are necessary for expanding the availability of OLEDs. We examined the configuration of the electron injection layer (EIL) suitable for air-stable OLEDs. An OLED with high operational stability was demonstrated by employing a newly developed EIL that requires no chemical n-doping for electron injection from the bottom cathode. [ABSTRACT FROM AUTHOR]

Recently, the first commercially successful applications for organic light-emitting devices (OLEDs) have entered the lighting and display markets, especially in smaller devices such as tablets and smartphones. In this article, we analyse materials and techniques used in OLED manufacturing in terms of sustainability and highlight upcoming trends which are supposed to further enhance this technologies sustainability. [ABSTRACT FROM AUTHOR]

The paper describes fundamental material properties required for modern day evaporation based AMOLED manufacturing and shows how material manufacturers have to adapt their products developments to those needs. [ABSTRACT FROM AUTHOR]

Novel derivatives of 1,2,4-triazol with benzthiazole fragment have been prepared, including Cu(II) and Be complexes. Their structure and spectral luminescent properties have been investigated. With ohydroxyphenylbenzthiazolyl-1,2,4-triazole as an example, the density functional theory has been applied to find the stable conformers with different structures of coordination nodes, stabilized by intramolecular hydrogen bonds between hydroxyl group hydrogen and either triazole of benzthiazole nitrogen. [ABSTRACT FROM AUTHOR]

Organic light emitting diodes (OLED) are developing rapidly and provide a huge market potential for signage, lighting and display applications. Cost efficient manufacturing of OLED components on different flexible substrates is under heavy investigation. In this paper focus is on polymer OLEDs and their non-vacuum solution processing using roll-to-roll (R2R) printing techniques. In this paper VTT's R2R manufacturing process capabilities for printed OLED components are presented. Several demonstrator concepts based on printed OLED technology are introduced including; printed OLED elements 1) in a smart package, 2) a 7-segment display integrated in a ID-1 card, 3) an electronics voting card with OLED indicator and 4) a 35 cm2 OLED lighting element printed on glass. [ABSTRACT FROM AUTHOR]

Self-aligned imprint lithography (SAIL) is currently being upgraded to a next stage to better address the needs for roll-to-roll compatible manufacturing of large-sized flexible OLED display backplanes. Cu and oxide semiconductors are preferred choices of materials, and control of process and yield becomes even more important an issue. [ABSTRACT FROM AUTHOR]

Electroluminescent polymeric materials have many applications, especially in organic light-emitting diodes (OLEDs). The use of these materials for this purpose requires knowledge of properties such as the thermal stability of materials, which can be studied through the glass transition temperature (Tg). A quantitative structure–property relationship (QSPR) model based on the support vector machine (SVM) was developed to predict theTgof polymeric materials used in the manufacture of electroluminescent devices (OLED). A total of 66 structures were selected from the literature. The structures were drawn in ChemSketch; their three-dimensional coordinates were calculated using E-CORINA and molecular descriptors were calculated using E-Dragon. The selection of the best descriptors was performed using the BestFirst method and prediction models were developed using the SVM in WEKA software. The best model was obtained using the following SVM parameters:C = 1.0, γ = 0.06 and ϵ = 0.001.The obtained model showed a correlation coefficient (R2) of 0.9626, a root mean square error of 0.0114, a mean absolute error of 0.0156 and a predictive squared correlation coefficient (Q2) of 0.909.These results show that QSPR using the SVM is a powerful tool that can be used to predict theTgof materials used in OLED fabrication. [ABSTRACT FROM PUBLISHER]

In recent years, much effort has been devoted to the development of the oxide TFT technologies to achieve low cost, large size, high specification displays. Since many solutions have been proposed to the subject about the most serious reliability issue as R&D, the development activities have turned into the production technology development as a following step. In this paper, the state of the oxide TFT developments for the manufacturing of AM-OLED displays and the mass-production-related issues will be discussed. [ABSTRACT FROM AUTHOR]

In this article the author explores the impact of advances in materials and processing technologies on the development and use of organic light emitting devices (OLEDs) in the global displays market. She notes changes in the market for OLEDs, such as the mass production of white colour OLED lighting by lighting manufacturer Lumitec, presents examples of OLED display technology, such as OLED televisions by electronics company Samsung, and the technology responsible for OLED.

The patterned color filter films with high concentration quantum dots (QD) were fabricated and proved to be applied as color converting film of white or blue OLEDs and replacement of color filter in LCD. QDs were dispersed in mass production color filter resin, and the quenching of QDs were effectively restrained. [ABSTRACT FROM AUTHOR]

Sandwich polyimide (PI) substrate of PI/ Inorganic /PI stacked structure was prepared. The sandwich substrate exhibits lower thermal expansion than single layer PI substrate. Flexible AMOLED displays were prepared with sandwich and single layer PI substrate, respectively. Panel with sandwich substrate exhibits better high temperature and high humid (HTHH) reliability. [ABSTRACT FROM AUTHOR]

Our previously established transfer technology using an inorganic separation layer was applied to enable a novel through electrode structure including a conductive material exposed after separation. Using this structure, we succeeded in fabricating a transmissive OLED and reflective LC hybrid display. [ABSTRACT FROM AUTHOR]

Although laser seal frit encapsulation owns great ability of protecting OLED from moisture and oxygen oxidation, the bonding strength is too weak to resist machenical force, which is easy to result in peeling the top and bottom substrates of OLED display. In this paper, we improve the bonding strength and production yield ratio by optimizing TFT array structure and process. [ABSTRACT FROM AUTHOR]

This paper describes a new bidirectional OLED microdisplay with an increased SVGA resolution. A bidirectional microdisplay means that the active area comprises of an OLED display with an additional nested image sensor. The paper shows latest results from the labs as well as first results in the field of capturing an eye scene. [ABSTRACT FROM AUTHOR]

In this paper, we present the development of phosphorescent host materials, having triplet energy more than 2.5 eV, to sensitize red phosphorescent dopants. Some of the new phosphorescent hosts exhibited lifetimes (T70) of about 40,000h at an initial luminance of 1000 cd/m2, with efficiencies as high as 28 cd/A at a driving voltage of about 4.2 V. [ABSTRACT FROM AUTHOR]

Passive Matrix Organic Diode is restricted to it's passive driving method, so the screen size and resolution is hard to be larger because of the brightness reduce with the row numbers. But PMOLED has simple fabrication process and less material cost compared to TFT-LCD and AMOLED panel. In this paper we deeply research the design of PMOLED panel, and finally we found a creative method to make the PMOLED panel larger and with higher resolution. Use our creative met hod we finally made a 3.5 inch PMOLED panel without bezel on right and left side, and so it can be scaled to make larger PMOLED with higher resolution. [ABSTRACT FROM AUTHOR]

We achieved operationally stable white OLEDs with an EML fabricated using a self-layered technique. LT50 of more than 10khr at an initial luminance of 1000cd/m2 was obtained by 1) suppressing exciplex formation between EML and ETL, 2) preventing Li diffusion into EMLs, and 3)applying dopants with shallow LUMO level and stable host materials. [ABSTRACT FROM AUTHOR]

We present recent developments of our core technologies targeted towards solution based OLED device manufacturing including non-aqueous (NQ) hole injection layer and solution processed hole transport layer. We demonstrate low voltage, and long lifetime devices with non-aqueous hole injection layer. Also, comparable performance with our intractable solution processed HTL versus NPB vapor HTL has been demonstrated in vapor WOLED devices in combination with our NQ hole injection layer technology. [ABSTRACT FROM AUTHOR]

This study proposes the unique method to analyze the cleanliness of the fine metal mask (FMM) used in OLED display manufacturing after FMM cleaning process. We developed a FMM-mimic microstructure as a substitute for the FMM, which can be used for the evaluation of cleaning efficiency. The FMM-mimic microstructure was fabricated using a combination of photolithography, reactive ion etching, anodic bonding and sand blasting processes. To demonstrate the proposed cleanliness analytical method, a 1.4 μm-thick Tris-(8-hydroxyquinoline) aluminum (Alq3) film was deposited on the FMM-mimic microstructure as a contaminant by vacuum thermal evaporation. The Alq3-deposited FMM-mimic microstructure was cleaned by N-methyl-2-pyrrolidone (NMP) with changing cleaning time. We analyzed the residual contaminants on the FMM-mimic microstructure using a fluorescence microscope. The developed FMM-mimic microstructure proves very convenient for inspecting the residual contaminant inside the gap through the transparent glass by general optical and fluorescence microscopy. [ABSTRACT FROM AUTHOR]

This study presents the slot-die coating process of two layers of organic materials for the fabrication of organic light emitting diodes (OLEDs). Poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS), which is commonly used in OLEDs and in organic photovoltaic devices as the hole injection layer (HIL), has been deposited via slot-die coating. Uniform films of PEDOT:PSS were obtained after optimizing the slot-die processing parameters: substrate temperature, coating speed, and ink flow rate. The film quality was examined using optical microscopy, profilometry, and atomic force microscopy. Further, poly(9,9-dioctylfluorene) (F8) and poly(9,9-dioctylfluorene-alt-benzothiadiazole) (F8BT), a well know polymer blend F8:F8BT, which is used as an emissive layer in OLEDs, has been slot-die coated. The optoelectronic properties of the slot-die coated F8:F8BT films were examined by means of photoluminescence (PL) and electroluminescence (EL) studies. The fabricated OLEDs, consisting of slot-die coated PEDOT:PSS and F8:F8BT films, were characterized to record the brightness and current efficiency. [ABSTRACT FROM AUTHOR]