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Efficient charge generation is essential for tandem organic light-emitting diode (OLED) devices. In this study, we introduce a p-type copper iodide (CuI) layer within the charge generation layer (CGL) that exhibits high charge generation efficiency in tandem OLED devices. Briefly, CuI is deposited as a thin layer via thermal evaporation technique. X-ray diffraction (XRD) analysis reveals the formation of γ-CuI, and the ultraviolet-visible (UV-Vis) spectral analysis demonstrates outstanding optical transparency (∼95%) of the deposited CuI films in the visible range. The current-voltage (I-V) and capacitance-voltage (C-V) analyses show that the p-type CuI layer is a vital and excellent charge generator and enhances the current density significantly. The tandem OLED device fabricated using Bphen:Liq/CuI/HAT-CN as the CGL results in a substantial 1.9-fold increase in current efficiency compared to the single-unit OLED device, approaching the theoretical two-fold increase. These findings highlight the potential of CuI as a promising p-type material for CGL design in tandem OLED devices. [ABSTRACT FROM AUTHOR]

Quantum‐dot light emitting diode (QD‐LED) displays have attracted great attention because of their high potential as a future display technology. The solution processability is also regarded as an important advantage for low‐cost manufacturing capabilities. However, the use of toxic and environmentally hazardous organic solvents is the dark side of solution processable QD‐LEDs. Chlorobenzene, chloroform, 1‐4 dioxane, and 1,2‐dichlorobenzene are representative toxic solvents for the manufacture of QD‐LEDs, and these are mainly used as solvents in the hole transport layer (HTL). Therefore, it is important to find an environmentally friendly solvent for (HTL). In this study, we report a new methodology for finding environmentally friendly solvents, that have good processability, and have solvent orthogonality with adjacent layers. [ABSTRACT FROM AUTHOR]

This study integrates an inductor into OLED structures to overcome challenges in low gray level expression. At the resonance frequency of 19 kHz, a linear correlation between voltage and emission intensity emerges, resulting in a significant decrease in turn‐on voltage. This method can make an alleviating gamma curve. [ABSTRACT FROM AUTHOR]