A wet and dry processable phosphorescent green dye based organic light-emitting diodes

• Published in: Dyes and pigments Vol. 113; pp. 341 - 350
• Main Authors: Jou, Jwo-Huei, Chen, Sun-Zen, An, Chih-Chia, Peng, Shiang-Hau, Ting, Tzu-Yu, Shyue, Jing-Jong, Chin, Chih-Lung, Chen, Chin-Ti, Wang, Ching-Wu
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.02.2015
• Subjects: Devices; Dry process; Drying; Dyes; Effectiveness; Electroluminescence; Emittance; Feasibility; Green emitter; High efficiency; Iridium; Organic light emitting diode; Organic light-emitting diodes; Wet process; Wet process; Iridium; Dry process; High efficiency; Green emitter; Organic light emitting diode
• ISSN: 0143-7208; 1873-3743
• DOI: 10.1016/j.dyepig.2014.09.001

Electroluminescence-efficiency green emitter with both wet- and dry-process feasibility is highly desirable to realize cost-effective large roll-to-roll manufacturing and high performance products. We demonstrate here a wet- and dry-process feasible green bis[5-methyl-8-trifluoromethyl-5H-benzo(c)(1,5)naphthyridin-6-one]iridium(picolinate) containing organic light-emitting diode device with an efficacy roll-up character between 100 and 1000 cd/m2. The newly synthesized iridium complex exhibits a relatively short excited-state lifetime (0.39 μs) and a high quantum yield of 74%, both which warrant this complex to be a highly electroluminescence active candidate. The wet processed device using a 3,5-di(9H-carbazol-9-yl) tetraphenylsilane host, for example, shows a 52 lm/W with an 18% external quantum efficiency (EQE) at 100 cd/m2, which increases to 61 lm/W with a 23% EQE at 1000 cd/m2. For the dry-processed device using a 4,4-bis(carbazol-9-yl)biphenyl host, it is 59 lm/W with a 25% EQE at 1000 cd/m2. •We report a new iridium complex exhibits a relatively short excited-state lifetime and a high quantum yield.•We demonstrate a both wet- and dry-process feasible green dye.•OLEDs with the green dye show an extraordinary efficacy roll-up phenomenon at high luminance.