Gao Zhixiang, Feng Zilong, Chen Weihua, Qu Wenshan, Ao Wei, Yang Tingting, Li Jiangang, Gao Feng
School of Architecture, Tianjin University Tianjin 300072 P. R. China
Shanxi Province Key Laboratory of Microstructure Functional Materials, Institute of Solid State Physics, Shanxi Datong University Datong 037009 P. R. China
RSC Adv. 2019 Feb 8;9(9):4957-4962. doi: 10.1039/c8ra09010f. eCollection 2019 Feb 5.
A non-doped multi-periodic structure of composite hole transport layer of [MoO/CBP] was applied to organic light-emitting diodes. All devices with such hole transport layers showed low turn-on voltage of about 3 V, ultra-high luminance of >110 000 cd m, high current efficiency of >50 cd A, and high EQE of more than 15%. The optimized device exhibited power efficiency increase of 66% and 18% relative to the single periodic and doped structure OLEDs. The achievement of the reduced driving voltage and improved power efficiency can be attributed to the significantly enhanced hole injection and transport induced by the multi-periodic structure of composite hole transport layer, which was demonstrated a series of hole-only devices. For improved hole injection and transport mechanism, we also provided a detailed discussion in combination with atomic force microscopy measurements.
一种[MoO/CBP]复合空穴传输层的非掺杂多周期结构被应用于有机发光二极管。所有具有这种空穴传输层的器件都表现出约3V的低开启电压、>110000 cd/m的超高亮度、>50 cd/A的高电流效率以及超过15%的高外量子效率。优化后的器件相对于单周期和掺杂结构的有机发光二极管，功率效率分别提高了66%和18%。驱动电压的降低和功率效率的提高可归因于复合空穴传输层的多周期结构显著增强了空穴注入和传输，这在一系列仅含空穴的器件中得到了证明。为了改进空穴注入和传输机制，我们还结合原子力显微镜测量进行了详细讨论。
