Highly efficient tandem organic light-emitting diodes using p-type metal halide copper iodide (CuI)
| Autor: | Kanghoon Kim, Jae-In Yoo, Hyo-Bin Kim, Sung-Cheon Kang, Jincheol Jang, Sundararajan Parani, Jang-Kun Song |
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| Jazyk: | angličtina |
| Rok vydání: | 2024 |
| Předmět: | |
| Zdroj: | Journal of Information Display, Vol 25, Iss 3, Pp 235-242 (2024) |
| Druh dokumentu: | article |
| ISSN: | 15980316 2158-1606 1598-0316 |
| DOI: | 10.1080/15980316.2023.2272561 |
| Popis: | 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. |
| Databáze: | Directory of Open Access Journals |
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