High Efficiency Non-Doped Organic Light Emitting Diodes Based on Pure Organic Room Temperature Phosphorescence by High-Lying Singlet Exciton Fission

被引:0
作者
Guo, Xiaomin [1 ]
Yang, Jie [2 ,3 ]
Yuan, Peisen [1 ]
Wang, Yunsheng [2 ]
Qiao, Xianfeng [1 ]
Li, Zhen [2 ,3 ]
Tang, Ben Zhong [1 ,2 ,4 ]
Ma, Dongge [1 ]
机构
[1] South China Univ Technol, Inst Polymer Optoelect Mat & Devices, Guangdong Prov Key Lab Luminescence Mol Aggregates, Guangdong Hong Kong Macao Joint Lab Optoelect & Ma, Guangzhou 510640, Peoples R China
[2] Tianjin Univ, Inst Mol Aggregat Sci, Tianjin 300072, Peoples R China
[3] Wuhan Univ, Dept Chem, Wuhan 430072, Peoples R China
[4] Chinese Univ Hong Kong Shenzhen, Shenzhen Inst Mol Aggregate Sci & Engn, Sch Sci & Engn, 2001 Longxiang Blvd, Shenzhen 518172, Peoples R China
基金
中国国家自然科学基金;
关键词
aggregation-induced emission; luminescence mechanism; magnetic field effects; non-doped organic light-emitting diodes; organic room temperature phosphorescence; TRIPLET; DEPENDENCE; DEVICES; HOST;
D O I
10.1002/lpor.202401015
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Heavy-metal-free pure organic room temperature phosphorescence (ORTP) holds great potential in the field of organic optoelectronic devices owing to low economic cost, simple preparation techniques, and high exciton utilization. However, it is still filled with challenges in realizing high efficiency organic light-emitting diodes (OLEDs) and exploring the internal physical mechanism based on these ORTP molecules. Here, a high-performance OLED induced by an unexpected interfacial spin-mixing process between the ORTP molecule and interlayers is demonstrated, and the high efficiency electroluminescence (EL) mechanism is studied through magneto-electroluminescence (MEL) and magneto-photoluminescence (MPL) measurements. The steady-state and transient PL properties imply that the interfacial effect is related to a high-lying singlet fission (HLSF) process in the ORTP molecule itself. Further, the HLSF process and the corresponding energy level position are confirmed by the incident wavelength- and temperature-dependent PL spectra and the magnetic-field-dependent transient PL. Finally, by optimizing the interfacial material adjacent to the emissive layer to utilize this interfacial spin mixing effect, a high-efficiency non-doped ORTP-OLED with external quantum efficiency of 16% and CIE coordinates of (0.27, 0.49) is developed. The proposed mechanism during the EL process will give insight to produce more efficient OLEDs based on ORTP materials in the future.
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页数:8
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