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In this work, the effect of Nb 2 O 5 oxide on the ∼2.0 μm band luminescence of Ho3+/Tm3+/Ce3+ tri-doped tellurite glass with composition of TeO 2 –ZnO–La 2 O 3 was studied. The doped tellurite glass was synthesized by using the melt-quenching method. Under the pumping of 808 nm laser diode (LD), a broad and relatively flat fluorescence emission ranging from 1600 to 2200 nm with a full width at half maximum (FWHM) of 374 nm was obtained by optimizing the concentration combination of Ho3+, Tm3+ and Ce3+ ions. The observed broad luminescence was attributed to the spectral overlapping between the energy level transitions from 3F 4 to 3H 6 of Tm3+ at 1.82 μm and that from 5I 7 to 5I 8 of Ho3+ at 2.0 μm. Further, an increment by about 143% in peak intensity of 1600∼2200 nm broad luminescence was found after the introduction of Nb 2 O 5 oxide, which is due to the enhanced energy transfer from Tm3+ to Ho3+ ions, and the increased multi-phonon relaxation (MPR) rate from higher levels to fluorescence emitting levels. It can be inferred from the results that a potential gain medium suitable for applications in optoelectronic devices operating at ∼2.0 μm band can be produced by incorporating an appropriate amount of Nb 2 O 5 oxide into Ho3+/Tm3+/Ce3+ tri-doped tellurite glass. [ABSTRACT FROM AUTHOR]

[Display omitted] A novel perovskite CaLa 4 Ti 4 O 15 :Eu3+ red-emitting phosphor was synthesized via a sol-combustion method, and Gd3+ was further co-doped into structure to improve the luminescence performance. The effects of Eu3+ doping and Gd3+ co-doping concentrations on the microstructure and luminescence properties were investigated. The red emission peaks of as-prepared phosphors originate from the 5D 0 →7F j electron transitions of Eu3+ ions. Under 273 nm excitation, the luminescence intensity of Eu3+ was significantly enhanced through the energy transfer between Gd3+ and Eu3+ in CaLa 4 Ti 4 O 15 , and the luminescence intensity was also improved even under the excitation of 394 nm. By combining red-emitting CaLa 4 Ti 4 O 15 :Eu3+, Gd3+ phosphor with commercial blue and green phosphors on n -UV chip (λ = 395 nm), an eye-friendly w -LEDs with appropriate correlated color temperature (4761 K) and high color rendering index (R a = 93.1) has been realized. The electroluminescence spectrum of the packaged red LED have an excellent match with the P R absorption of plants. In addition, when introducing CaLa 4 Ti 4 O 15 :Eu3+, Gd3+ phosphor into a commercial w -LED with YAG:Ce3+, the adjustable chromaticity parameters like CCT and CRI values can be obtained. These results demonstrated that the as-prepared CaLa 4 Ti 4 O 15 :Eu3+, Gd3+ phosphor is an outstanding candidate as the red component for the application of w -LEDs and plants lighting. [ABSTRACT FROM AUTHOR]

A series of Sr 9 Y(PO 4) 7 :Eu3+ and Sr 9 Y(PO 4) 7 :Eu3+, Gd3+ red-emitting phosphors were prepared via a high-temperature solid-state method, Gd3+ ion was co-doped in Sr 9 Y(PO 4) 7 :Eu3+ as sensitizer to enhance the luminescence property. The X-ray diffraction results verify that the structure of the as-prepared samples is consistent with the standard Sr 9 Y(PO 4) 7 phase. All the Sr 9 Y(PO 4) 7 :Eu3+ samples show both characteristic emission peaks at 594 nm and 614 nm under near-ultraviolet excitation of 394 nm. The co-doping of Gd3+ significantly improves the luminescence intensity of the Sr 9 Y(PO 4) 7 :Eu3+ phosphors due to the crystal field environment effect and energy transfer of Gd3+→Eu3+ caused by the introduction of Gd3+, especially Sr 9 Y(PO 4) 7 :0.11Eu3+, 0.05Gd3+, which emission intensity is higher than that of Sr 9 Y(PO 4) 7 :0.11Eu3+ by 1.21 times. The color purity and lifetime of Sr 9 Y(PO 4) 7 :0.11Eu3+, 0.05Gd3+ phosphor are 88.26% and 3.7615 ms, respectively. A w -LED device was packaged via coating the as-prepared phosphor on n-UV chip of 395 nm with commercial phosphors. These results exhibit that the Sr 9 Y(PO 4) 7 :Eu3+, Gd3+ red-emitting phosphor can be used as a red component in the w -LEDs application. [ABSTRACT FROM AUTHOR]

In this paper, the luminescence properties of Ca 2 ZnSi 2 O 7 :Sm3+ phosphors were improved by co-doping with M3+ (M = Bi, Al) via the sol-combustion method. The structure and luminescence properties of the Ca 2 ZnSi 2 O 7 :Sm3+, M3+ samples were investigated in detail, especially the luminescence enhancement effect of Bi3+/Al3+ co-doping. XRD results indicated that moderate Bi3+/Al3+ co-doping in the host structure did not change the tetragonal structure of Ca 2 ZnSi 2 O 7. The series of Ca 2 ZnSi 2 O 7 :Sm3+, M3+ phosphors could be excited by 402 nm near-ultraviolet light and several significant emission peaks were obtained at 567, 604 and 650 nm, which originated from the electron transitions of Sm3+ from 4G 5/2 to 6H 5/2 , 6H 7/2 and 6H 9/2 levels, respectively. The luminescence intensity of Ca 2 ZnSi 2 O 7 :Sm3+ was markedly enhanced through Bi3+/Al3+ co-doping, which could be explained by Al3+ decreasing the crystal field symmetry and greatly increasing the red luminescence intensity, and Bi3+ functioning as a sensitizer to increasing the luminescence intensity through energy transfer from Bi3+ to Sm3+ ions. In conclusion, the excellent Ca 2 ZnSi 2 O 7 :Sm3+, M3+ phosphors have potential application as red phosphors in white light emitting diodes. [ABSTRACT FROM AUTHOR]

The structural and optical characteristics of Nd3+-Yb3+ doped CaF 2 phosphors with and without the addition of Li+ ions are described in this work. The phosphors synthetized by hydrothermal and co-precipitation methods showed near-infrared (NIR) luminescence emission associated with inter-electronic transition of the Yb3+ ion in the range of 900–1050 nm via energy transfer process from Nd3+ ions under visible light excitation. The addition of Li+ to these phosphors resulted in an improvement of the NIR luminescence intensity by a factor up to 5. The effect of the incorporation of Li+ ions into the CaF 2 crystallite structure, the reduction of luminescence quenching states, as well as the energy transfer mechanism involved are discussed. [ABSTRACT FROM AUTHOR]

Upconversion nanocrystals that converted near-infrared radiation into emission in the ultraviolet spectral region offer many exciting opportunities for drug release, photocatalysis, photodynamic therapy, and solid-state lasing. However, a key challenge is the development of lanthanide-doped nanocrystals with efficient ultraviolet emission, due to low conversion efficiency. Here, we develop a dye-sensitized, heterogeneous core–multishelled lanthanide nanoparticle for ultraviolet upconversion enhancement. We systematically study the main influencing factors on ultraviolet upconversion emission, including dye concentration, excitation wavelength, and dye-sensitizer distance. Interestingly, our experimental results demonstrate a largely promoted multiphoton upconversion. The underlying mechanism and detailed energy transfer pathway are illustrated. These findings offer insights into future developments of highly ultraviolet-emissive nanohybrids and provide more opportunities for applications in photo-catalysis, biomedicine, and environmental science.

A series of K 7 CaY 2−x (B 5 O 10) 3 :xEu3+ (KCYB:xEu3+) phosphors have been successfully synthesized using a high-temperature solid-state method, while Sm3+ and Gd3+ ions were co-doped to enhance the luminous performance. The crystal structure and occupation position of Eu3+/Sm3+/Gd3+ in the borate K 7 CaY 2 (B 5 O 10) 3 host were investigated by XRD technique and Rietveld refinement data analysis. Under the characteristic excitation of Sm3+/Gd3+, it was found that the luminescence intensity of Eu3+ could considerably increase due to the energy transfer from Sm3+/Gd3+ to Eu3+ in KCYB, which was also increased even under 393 nm excitation (transition of Eu3+). To evaluate the sensitization of Sm3+/Gd3+ to Eu3+, the doping contents of Sm3+ and Gd3+ ions were fixed. The photoluminescence performance and lifetime decay curves of all co-doped samples were tested. The higher energy transfer efficiencies for Sm- and Gd-doped KCYB:Eu3+ phosphors reached 31.45% and 57.49%, respectively. The dipole-dipole interaction has been demonstrated to be the dominant energy transfer mechanism. KCYB:Eu3+,Sm3+/Gd3+ phosphors exhibit red light emission at 610 nm with a high quantum yield (86.98%) and color purity (100%), good thermal stability (57.97%@473 K), and the emission spectra lie within the red photopigments (P R) absorption spectra of plants. These results show that the prepared K 7 CaY 2 (B 5 O 10) 3 :Eu3+,Sm3+/Gd3+ phosphors may provide promising options for red phosphors in plant lighting applications. [Display omitted] • K 7 CaY 2 (B 5 O 10) 3 :Eu3+,Sm3+/Gd3+ phosphors have been successfully prepared. • The impact of Eu3+/Sm3+/Gd3+ ions on luminescence properties is explored. • Energy transfer process from Sm3+/Gd3+ to Eu3+ is thoroughly investigated. • The synthesized red phosphors offer promising options for plant growth LEDs. [ABSTRACT FROM AUTHOR]

Abstract: A series of Ca5(PO4)3F:Dy3+, Eu3+ phosphors was synthesized by a solid‐state reaction method. The XRD results show that all as‐prepared Ca5(PO4)3F:Dy3+, Eu3+ samples match well with the standard Ca5(PO4)3F structure and the doped Dy3+ and Eu3+ ions have no effect on the crystal structure. Under near‐ultraviolet excitation, Dy3+ doped Ca5(PO4)3F phosphor shows blue (486 nm) and yellow (579 nm) emissions, which correspond to 4F9/2→6H15/2 and 4F9/2→6H13/2 transitions respectively. Eu3+ co‐doped Ca5(PO4)3F:Dy3+ phosphor shows the additional red emission of Eu3+ at 631 nm, and an improved color rendering index. The chromaticity coordinates of Ca5(PO4)3F:Dy3+, Eu3+ phosphors also indicate the excellent warm white emission characteristics and low correlated color temperature. Overall, these results suggest that the Ca5(PO4)3F:Dy3+, Eu3+ phosphors have potential applications in warm white light‐emitting diodes as single‐component phosphor. [ABSTRACT FROM AUTHOR]

Abstract: A sensitive luminescence enhancement system has been developed for the determination of trace amounts of trivalent europium. The luminescence intensity of europium complex with N-(3,5-dibromosalicylidene)-2-aminopyridine (HL) was greatly enhanced after the addition of 1,10-phenanthroline (Phen) in acetonitrile solution. The excitation and emission wavelengths were 274 and 617nm respectively. Under optimal conditions, the luminescence intensities varied linearly with Eu3+ concentration in the range of 4.0×10−6 ∼2.4×10−5 molL−1 with a detection limit of 4.3×10−10 molL−1. This method was successfully applied to determine the trace amounts of Eu3+ in a high purity Gd2O3 matrix and in a mixed lanthanide sample. Energy transfer mechanism and luminescence enhancement of HL–Phen–Eu ternary system were studied. The results indicate that both HL and Phen are good sensitizers for the luminescence of Eu3+ ions, as energy gap between the lowest triplet level of HL/Phen and the resonant level of Eu3+ (5D1) exists around the optimal value (3000±500cm−1). The interference by some other lanthanide ions and common ions were also studied. [Copyright &y& Elsevier]

Abstract: A new sensitive quaternary luminescence enhancement system was developed successfully to determine the trace amounts of Eu3+ and Zn2+. The luminescence intensity of Eu–N-(3-methoxysalicylidene)-2-aminopyridine system was greatly increased by the addition of 1,10-phenanthroline and Zn2+. The excitation and emission wavelengths were 274 and 617nm, respectively. Under optimal conditions, the luminescence intensity of the system showed a linear response toward Eu3+ in the range of 6.0×10−6–2.5×10−5 molL−1 with a detection limit of 2.0×10−9 molL−1. This method was successfully applied for the determination of trace amounts of Eu3+ in a high purity Gd2O3 matrix and a synthetic matrix. In addition, it was found that under optimal conditions, the luminescence intensity of the system decreased linearly with the increase of Zn2+ concentration, ranging from 2.0×10−6 to 1.8×10−5 molL−1 with a detection limit of 2.8×10−8 molL−1. This method was also successfully applied to determine the trace amounts of Zn2+ in a high purity Mg(NO3)2·6H2O matrix and a synthetic sample. The interferences of other lanthanide ions and some common coexisting ions were investigated. The mechanism for energy transfer and luminescence enhancement of this quaternary system was also studied systematically. [Copyright &y& Elsevier]

Abstract: Au nanoparticles (NPs) attached β-NaYF4 nanocrystals codoped with Gd3+–Yb3+–Tm3+ were synthesized by a facial solution method. The UV–vis-near-infrared absorption spectrum shows typical surface plasmon resonance band of Au NPs in addition to the characteristic absorption peaks of Yb3+ ion. X-ray diffraction and selected area electron diffraction results indicate the existence of Au NPs. The transmission electron microscopic image reveals the formation of Au@NaYF4 nanostructures. Enhanced ultraviolet (UV) upconversion luminescence (UCL) was observed in the nanostructures under the excitation of 980-nm infrared laser. The largest enhancement factor was obtained as 76 for the 6IJ → 8S7/2 emission of Gd3+ ions, which was much larger than those emission enhancement factors of Tm3+. It is for the first time to our knowledge that the emission enhancement of Gd3+ ions was obtained. Local field enhancement induced by Au NPs was found to be responsible for the UCL enhancement, which is the further experimental evidence of local field enhancement theory. Magnetic measurements of the Au@NaYF4 nanostructure indicated it would have potential application in magnetic resonance imaging. [Copyright &y& Elsevier]

Abstract: This work reports a systematic study on bridging between structure and optimum luminescence for Ce1−x Gd x F3:Eu3+ nanoparticles. It is found that all Ce1−x Gd x F3:Eu3+ nanoparticles were nearly monodispersed, showing average grain diameter of 30–35nm. Regardless of the dopant level, all nanocrystals crystallized in a single hexagonal phase. With increasing Gd3+ content, the lattice dimension for Ce1−x Gd x F3:Eu3+ linearly decreased, which was followed by the highly distorted lattice symmetry surrounding Eu3+. The consequence of the structural modification is that the color purity was significantly improved. Furthermore, the excitation energy of Ce3+ in the ultraviolet range was efficiently transferred to Eu3+ ions via the sensitizer Gd3+, which significantly enhanced the red emission and showed a maximized quantum efficiency of 59.7%. [Copyright &y& Elsevier]

Abstract: Rare-earth complexes [(Tb x Tm y )L5(ClO4)2](ClO4)·3H2O(x:y=1.000:0.000, 0.999:0.001, 0.995:0.005, 0.990:0.010, 0.950:0.050, 0.900:0.100, 0.800:0.200, 0.700:0.300; L=C6H5COCH2SOCH2COC6H5) were synthesized and characterized with elemental analysis, infrared spectra (IR) and 1H NMR. The photophysical properties of these complexes were studied in detail with ultraviolet absorption spectra, fluorescent spectra and lifetimes. The fluorescence spectra and decay curves of complexes indicated that the fluorescence emission intensity was enhanced and the fluorescence lifetime was prolonged by Tm (III), which may be due to the intra-molecular energy transfer between inert rare-earth ions and active rare-earth ions. The complexes showed the best properties when the mole ratio of Tb (III) to Tm (III) is 0.995:0.005. The intensity of fluorescence can be increased to 208%. Additionally, the energy-transfer mechanisms between the ligand and the central Tb (III) ions were discussed. [Copyright &y& Elsevier]

Abstract: In this paper, a novel kind of organic–inorganic monomer, HIPA-TESPIC, has been achieved by modifying 5-hydroxyisophthalic acid (abbreviated as HIPA) with 3-(triethoxysilyl)-propyl isocyanate (abbreviated as TESPIC). The organic–inorganic monomers (HIPA-TESPIC) with two components equipped with covalent bonds can behave as a functional molecular bridge, which can not only coordinate to RE ions but also occur in in situ sol–gel process with inorganic host precursor tetraethoxysilane (TEOS), resulting a kind of molecular hybrid material (named as RE-HIPA-TESPIC) with double chemical bond (RE–O coordination bond and Si–O covalent bond). 1H NMR, Fourier transform infrared (FT-IR) were applied to characterize the structure of HIPA-TESPIC and UV–vis spectrophotometer, phosphorescence, and luminescence spectra were applied to characterize the photophysical properties of the obtained hybrid material. Luminescent hybrid materials consisting of active rare earth ions (Tb3+, Eu3+)–inert rare earth ions (Y3+, La3+, Gd3+) complex covalently bonded to a silica-based network have been obtained in situ via a sol–gel approach. Through co-hydrolysis and polycondensation, active rare earth ions and inert rare earth ions can be introduced in the same organic–inorganic hybrid monomer and then formed Si–O backbones. The luminescent behavior has been studied with the different ratios of active rare earth ions–inert rare earth ions, which suggests that the existence of inert rare earth ions can enhance the luminescence intensity, which may be due to the intramolecular energy transfer between inert rare earth ions and active rare earth ions. [Copyright &y& Elsevier]

Abstract: Two series of polyimides exhibiting red light luminescence were synthesized. The energy transfer between poly(N-vinylcarbazole) (PVK) and polyimide enhances the red light luminescence of the polyimide. Meanwhile, the purplish blue light luminescence of the pure PVK polymer was not or hardly observed in the light luminescence spectra of the polyimide/PVK blend depending on the composition of the blend. There was more spectral overlap between the PL emission of PVK and the absorption of the pyromellitic dianhydride (PMDA)–2,7-diaminofluorene (DAF) polyimide than that of the PMDA–3.7-diamino-2.8-dimethyldibenzo-thiophene sulfone (DAS) polyimide. Therefore, the PMDA–DAF polyimide/PVK blends that showed complete energy transfer exhibited the emission spectrum mostly from the polyimide. Incorporating a modified silicone surfactant further showed remarkable enhancement of the red luminescence by improving the miscibility of the blends of PMDA–DAF polyimide with PVK. [Copyright &y& Elsevier]

Upconversion nanocrystals that converted near-infrared radiation into emission in the ultraviolet spectral region offer many exciting opportunities for drug release, photocatalysis, photodynamic therapy, and solid-state lasing. However, a key challenge is the development of lanthanide-doped nanocrystals with efficient ultraviolet emission, due to low conversion efficiency. Here, we develop a dye-sensitized, heterogeneous core–multishelled lanthanide nanoparticle for ultraviolet upconversion enhancement. We systematically study the main influencing factors on ultraviolet upconversion emission, including dye concentration, excitation wavelength, and dye-sensitizer distance. Interestingly, our experimental results demonstrate a largely promoted multiphoton upconversion. The underlying mechanism and detailed energy transfer pathway are illustrated. These findings offer insights into future developments of highly ultraviolet-emissive nanohybrids and provide more opportunities for applications in photo-catalysis, biomedicine, and environmental science. [ABSTRACT FROM AUTHOR]

This research adopted a strategy on alkali metal ions (Li+, Na+, K+) as charge compensators to improve luminescence properties and QY of phosphor. Li+, Na+, K+ co-doped significantly improve the luminescence intensity of phosphor. These phosphors all exhibit good color stability. Significantly, Ca 0.9 Al 11.89 P 0.1 O 19.1 :0.01Mn4+,0.1Na+ phosphor demonstrates excellent color purity (97.0%) and quantum yield (60.7%). [Display omitted] • A series of CaAl 11.9 P 0.1 O 19.1 :Mn4+ red-emitting phosphor is prepared for the first time. • Charge compensation ions Li+, Na+, K+ co-doped improve the luminescence intensity of phosphor. • Na+ co-doped phosphor has excellent color purity (97.0%) and quantum yield (60.7%). A series of novel Mn4+-doped and Mn4+/R+ co-doped (R = Li, Na, K) CaAl 11.9 P 0.1 O 19.1 red-emitting phosphors were synthesized by high-temperature solid-state reaction, and their crystal structure, luminescence properties and thermal stability were studied in detail. Under the excitation of the optimal wavelength (396 nm), all phosphors exhibit a strong red-light emission, which corresponds to the 2E g →4A 2g transition of Mn4+. The optimal Mn4+ doping concentration was determined to be x = 0.01 in the CaAl 11.9- x P 0.1 O 19.1 : x Mn4+ phosphor, and excessive dopants will cause concentration quenching due to energy transfer interaction between Mn4+ ions. The alkali metal charge compensation ions Li+, Na+ and K+ co-doped with Mn4+ significantly improve the luminescence intensity of CaAl 11.89 P 0.1 O 19.1 :0.01Mn4+ phosphor, where Na+ co-doped phosphor has the strongest luminescence intensity, and K+ co-doped phosphor has the longest luminescence lifetime. Due to the ion radius of charge compensation ion R+ is closest to that of Ca2+ in the host, it is easier to occupy R+ for the Ca2+ lattice site. R+ can eliminate the positive defects caused by Mn4+ replacing with Al3+, thereby keeping charge valance to be neutral. Moreover, Ca 0.9 Al 11.89 P 0.1 O 19.1 :0.01Mn4+,0.1Na+ phosphor has excellent color purity (97.0%) and quantum yield (60.7%), indicating that the phosphor has potential application prospects for use in white-light-emitting diodes. [ABSTRACT FROM AUTHOR]

A series of novel Li+ doped Bi3.46Ho0.04Yb0.5Ti3O12 (BHYTO: xLi, 0 ≤ x ≤ 0.15) upconversion phosphors were prepared through a sol-gel-sintering method. There exist three emission bands centered at 545 nm, 658 nm, and 756 nm in the upconversion emission spectra at 980 nm excitation, corresponding to energy transitions of 5F4/5S2 → 5I8, 5F5 → 5I8 and 5F4/5S2 → 5I7 of Ho3+, and the upconversion emission intensity of BHYTO: 0.05Li is about 2.2 times stronger than that of BHYTO samples. The luminescent lifetime of the strongest emission (545 nm) is in the range of 45.25 to 65.99 μs for the different BHYTO: xLi phosphors. The energy transfers during the upconversion pumping process from Yb3+ to Ho3+ are mainly responsible for all the emissions, each belonging to a double-photon process. Li+ mainly entered into the interspace sites or occupied Bi3+ sites in Bi4Ti3O12 host during the fabrication process according to its dosage, and the possibility is very low for Li+ to take part in the energy transfer process directly due to its lack of matching levels with 4f of Ho3+ and Yb3+. However, Li+ doping can not only increase the size of crystal grains to improve crystallinity through XRD analysis, but also reduced oxygen vacancies to decrease the number of quenching centers through XPS analysis. The improved crystallinity and reduced quenching centers are proposed to be the main causes for the enhanced upconversion luminescence of the Li+ doped BHYTO phosphor. [ABSTRACT FROM AUTHOR]

Sm3+, Eu3+ sole- and co-doped LaOF nanoparticles with rhombohedral crystal structure were synthesized via hydrothermal method followed a post-annealing process. The samples were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and photoluminescence techniques. The XRD result shows that the samples exhibit a rhombohedral phase in crystal structure. For Sm3+, Eu3+ co-doped LaOF nanoparticles, pumping Sm3+ to its excited 4G 9/2 level by 442 nm laser, the intense characteristic emissions of Eu3+ ion were observed, indicating that the energy transfer from Sm3+ to Eu3+ ions occurred. The intensities of Eu3+ emissions due to energy transfer increased with increasing the doping concentration of Eu3+ acceptor. The enhancement of Eu3+ red-light emission at 610 nm through co-doping Sm3+ ion was also observed when the Sm3+, Eu3+ co-doped LaOF nanoparticles excited by 532 nm laser. The optimum concentration of Sm3+ co-dopant is 0.5 mol% for enhancing the strongest luminescence of Eu3+ red-light. • Sm3+, Eu3+ sole- and co-doped LaOF nanoparticles were synthesized by hydrothermal method. • Energy transfer from (4G 5/2) Sm3+→(5D 0) Eu3+ ions was observed in LaOF:Sm3+-Eu3+ nanoparticles. • The enhancement of Eu3+ red-light emission at 610 nm by co-doping Sm3+ ion was achieved. • The concentration dependences of energy transfer and red-610 nm PL enhancement were investigated systematically. [ABSTRACT FROM AUTHOR]

In this study, we report an effective excitation energy transfer from J-aggregates to exciton traps (specially selected dye molecules) located within different polymer layers by Förster resonance energy transfer mechanism. With an increase in the distance d between the layer of J-aggregates and that of the exciton traps, the intensity of the traps luminescence reaches a maximum at the certain spacer layer thickness, instead of a gradual decrease according to the Förster law ~ d −6 , and then drops down. Moreover, the decay time of the traps luminescence synchronously changes, reaching its maximum at the maximum of the traps luminescence. The observed effect takes place for different types of J-aggregates and exciton traps and even at the direct excitation into the traps absorption band. Despite that, the critical distance between J-aggregates and exciton traps, at which the maximum of the traps luminescence and its highest decay time are observed, was nearly the same for all J-aggregates – exciton traps pairs. • The thin layered polymer films based on cyanine dye J-aggregates were created. • An effective energy transfer from J-aggregates to exciton traps was realized. • It nonmonotonically depends on a distance between the J-aggregates and traps. • The trap decay time is synchronously changing with the trap luminescence intensity. • Plasmon-like exciton-enhanced luminescence mechanism was proposed. [ABSTRACT FROM AUTHOR]