Highly efficient tandem organic light-emitting diodes using p-type metal halide copper iodide (CuI)

IF 3.7 3区 工程技术 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Information Display Pub Date : 2023-11-06 DOI:10.1080/15980316.2023.2272561
Kanghoon Kim, Jae-In Yoo, Hyo-Bin Kim, Sung-Cheon Kang, Jincheol Jang, Sundararajan Parani, Jang-Kun Song
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Abstract

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.
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p型金属卤化物-碘化铜(CuI)高效串联有机发光二极管
高效的电荷产生是串联有机发光二极管(OLED)器件的关键。在本研究中,我们在电荷产生层(CGL)内引入了p型碘化铜(CuI)层,该层在串联OLED器件中具有较高的电荷产生效率。简单地说,CuI是通过热蒸发技术沉积成薄层的。x射线衍射(XRD)分析显示了γ-CuI的形成,紫外-可见(UV-Vis)光谱分析表明,沉积的CuI薄膜在可见光范围内具有优异的光学透明度(~ 95%)。电流-电压(I-V)和电容-电压(C-V)分析表明,p型CuI层是一种重要的、优良的电荷发生器,能显著提高电流密度。使用Bphen:Liq/CuI/HAT-CN作为CGL制造的串联OLED器件与单单元OLED器件相比,电流效率提高了1.9倍,接近理论的2倍。这些发现突出了CuI作为一种有前途的p型材料用于串联OLED器件的CGL设计的潜力。
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来源期刊
Journal of Information Display
Journal of Information Display MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
7.10
自引率
5.40%
发文量
27
审稿时长
30 weeks
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