All-small-molecule efficient white organic light-emitting diodes by multi-layer blade coating

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• 作者：Han-Cheng Yeh^a ; Hsin-Fei Meng^b ; ^{meng@mail.nctu.edu.tw} ; Hao-Wu Lin^c ; ^{hwlin@mx.nthu.edu.tw} ; Teng-Chih Chao^d ; Mei-Rurng Tseng^d ; Hsiao-Wen Zan^a
• 关键词：Phosphorescence ; White light ; Solution process ; Small-molecule OLEDs
• 刊名：Organic Electronics
• 出版年：2012
• 期刊代码：137_15661199
• 类别：et
• 出版时间：May, 2012
• 卷：13
• 期：5
• 页码：914-918
• 文件大小：388 K

摘要

Blue and white small-molecule organic light-emitting diodes are fabricated by multi-layer blade coating on hot plate at 80 掳C with hot wind. Uniform multi-layer structures are made without dissolution due to rapid drying. Only small molecules originally developed for vacuum deposition are used. For hole transport layer of, 4鈥?4鈥?tris(carbazol-9-yl)triphenylamine (TCTA), electron transport layer of 2,2鈥?2鈥?(1,3,5-benzinetriyl)-tris(1-phenyl-1-H-benzimidazole) (TBPI), emissive layer host of, 6-bis(3-(9H-carbazol-9-yl)phenyl)pyridine (26DCzPPy), triplet emitters of bis(3,5-difluoro-2-(2-pyridyl)phenyl-(2-carboxypyridyl)iridium(III) (FIrpic), and cathode of LiF/Al, the peak current efficiency for blue emission is 25.1 cd/A (10.8%and 9.3 lm/W). Orange emitter iridium(III)bis (4-(4-t-butylphenyl) thieno[3,2-c]pyridinato-N,C2鈥?acetylacetonate (PO-01-TB) is added to obtain white emission with CIE coordinate of (0.39, 0.46) . The current efficiency is 34.2 cd/A (11.6%and 12 lm/W) at maximum, 32.4 cd/A at 1000 cd/m², and 31 cd/A at 10,000 cd/m².