標題: Interface and thickness tuning for blade coated small-molecule organic light-emitting diodes with high power efficiency
作者: Chang, Yu-Fan
Chiu, Yu-Chian
Chang, Hao-Wen
Wang, Yi-Siang
Shih, Yi-Lun
Wu, Chih-Hao
Liu, Yi-Lun
Lin, Yu-Sheng
Meng, Hsin-Fei
Chi, Yun
Huang, Heh-Lung
Tseng, Mei-Rurng
Lin, Hao-Wu
Zan, Hsiao-Wen
Horng, Sheng-Fu
Juang, Jenh-Yih
影像與生醫光電研究所
電子物理學系
物理研究所
光電工程學系
Institute of Imaging and Biomedical Photonics
Department of Electrophysics
Institute of Physics
Department of Photonics
公開日期: 28-Sep-2013
摘要: We developed a general method based on fluorescence microscopy to characterize the interface dissolution in multi-layer organic light-emitting diodes (OLEDs) by blade coating. A sharp bi-layer edge was created before blade coating, with the bottom layer being insoluble and top layer soluble. After blade coating, fluorescence images showed that the edge of the top layer shifted when the layer dissolved completely, whereas the bottom layer's edge remained in place as a positioning mark. The dissolution depth was determined to be 15-20 nm when the emissive-layer host of 2,6-bis (3-(9H-carbazol-9-yl) phenyl) pyridine (26DCzPPy) was coated on the hole-transport layer of N, N'-bis(naphthalen-1-yl)-N, N'-bis(phenyl)-benzidine(NPB), which was consistent with a sudden drop in efficiency of orange OLEDs with layer thickness below 20 nm. Thus, the layer thickness of OLEDs was optimized to stay more than 20 nm for blade coating. For a two-color white OLED with the structure TCTA/26DCzPPy:PO-01-TB:FIrpic/TPBI, efficiency was 24 cd/A and 8.5 lm/W at 1000 cd/m(2). For a three-color white OLED with Os(fptz)(2)(dhpm) added as the emitter, the efficiency was 12.3 cd/A and 3.7 lm/W at 1000 cd/m(2). For a green device with the structure TCTA/26DCzPPy: Ir(mppy)(3)/TPBI, the efficiency was 41.9 cd/A and 23.4 lm/W at 1000 cd/m(2). VC 2013 AIP Publishing LLC.
URI: http://dx.doi.org/10.1063/1.4821881
http://hdl.handle.net/11536/23020
ISSN: 0021-8979
DOI: 10.1063/1.4821881
期刊: JOURNAL OF APPLIED PHYSICS
Volume: 114
Issue: 12
結束頁: 
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