標題: All-Solution-Processed Red and Orange-Red Organic Light-Emitting Diodes with High-Efficiencies: The Effect of Mixed-Host Emissive Layers and Thermal Annealing Treatment
作者: Chang, Yu-Fan
Yang, Lan-Sheng
Su, Hsiao-Tso
Liao, Si-Yi
Niu, Mu-Chun
Mahesh, K. P. O.
Chen, Chao-Hsuan
Chao, Yu-Chiang
Meng, Hsin-Fei
Huang, Heh-Lung
Chao, Teng-Chih
Tseng, Meu-Rurng
Luo, Chih-Wei
Zan, Hsiao-Wen
Horne, Sheng-Fu
電子物理學系
物理研究所
光電工程學系
Department of Electrophysics
Institute of Physics
Department of Photonics
關鍵字: blade coating;mixed-host emissive layers;organic light-emitting diodes;phosphorescence;thermal annealing
公開日期: 1-Sep-2019
摘要: The instability of the organic light-emitting diodes (OLEDs) during operation can be attributed to the existence of point defects on the organic layers. In this work, the effect of mixed-host emissive layer and the thermal annealing treatment were investigated to eliminate defects and to boost the device performance. The mixed-host system includes 4,4 ',4 ''-tri (9-carbazoyl) triphenylamine (TCTA) and 2,7-bis(diphenylphosphoryl)-9, 9 '-spirobi[fluorene] (SPPO13). The mixed-host emissive layer with thermal annealing treatment showed low roughness and few pinholes, and the devices fabricated from this emissive layer exhibited high efficiencies, high stabilities, and long lifetimes. The red and orange-red OLEDs exhibited efficiencies of 13.9 cd/A and 24.35 cd/A, respectively. The longest half-lifetime (L-0=500 cd/m(2)) of the red and orange-red OLEDs were 158 h and 180 h, respectively. Efforts were made to solve problems in large-area coating and to reduce the number of defects on in organic layer. Large-active-area (active area=3 cmx4 cm) red phosphorescent OLEDs (PhOLEDs) devices were realized with very high current efficiency up to 9 cd/A.
URI: http://dx.doi.org/10.1002/cplu.201900248
http://hdl.handle.net/11536/152786
ISSN: 2192-6506
DOI: 10.1002/cplu.201900248
期刊: CHEMPLUSCHEM
Volume: 84
Issue: 9
起始頁: 1375
結束頁: 1383
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