Highly Efficient and Stable Green Phosphorescent Light-Emitting Diodes Based on Solution-Processable Ir(III) Complexes with Electron-Transporting Ancillary Ligands

被引：10

作者：

Park, Ho-Yeol ^{[1
,2
]}

Ameen, Shahid ^{[3
,4
]}

Kumaresan, Raja ^{[1
,2
]}

Lee, Jieun ^{[1
,2
,5
]}

Park, Jeonghyeon ^{[1
,2
]}

Song, Donghyun ^{[1
,2
]}

Lee, Jaemin

Heo, Yuchan ^{[3
,4
]}

Kim, BongSoo ^{[3
,4
]}

Jin, Sung-Ho ^{[1
,2
]}

机构：

[1] Pusan Natl Univ, Dept Chem Educ, Inst Plastic Informat & Energy Mat, Busan 46241, South Korea

[2] Pusan Natl Univ, Sustainable Utilizat Photovolta Energy Res Ctr, Busan 46241, South Korea

[3] Ulsan Natl Inst Sci & Technol UNIST, Grad Sch Semicond Mat & Device Engn, Dept Chem, Ulsan 44919, South Korea

[4] Ulsan Natl Inst Sci & Technol UNIST Ulsan, Grad Sch Carbon Neutrality, Ulsan 44919, South Korea

[5] Korea Res Inst Chem Technol, Adv Mat Div, Daejeon 34114, South Korea

来源：

ADVANCED OPTICAL MATERIALS | 2023年 / 11卷 / 09期

关键词：

device stability; green phosphorescent light-emitting diodes; hole injection layer; Ir(III) dopants; solution-processed; thermal crosslinking; IRIDIUM(III) COMPLEXES; ELECTROLUMINESCENCE; PHOTOLUMINESCENCE;

D O I：

10.1002/adom.202202641

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Two green heteroleptic Ir(III) complexes are reported, namely, bis[5-(2-ethylhexyl)-8-trifluoromethyl-5H-benzo[c][1,5]-naphthyridin-6-one](2-(5-phenyl-1,3,4-oxadiazol-2-yl)phenolate)iridium (III) (Ir(CF3BNO)(2)-pop) and bis[5-(2-ethylhexyl)-5H-benzo[c][1,5]naphthyridin-6-one](2-(5-phenyl-1,3,4-oxadiazol-2-yl)phenolate)iridium (III) (Ir(BNO)(2)-pop) for solution-processed phosphorescent organic light-emitting diodes (PHOLEDs). Both the Ir(III) complexes exhibit high external quantum efficiency (EQE) and intense green emission upon using poly(3,4-ethylenedioxythiophene):polystyrene sulfonic acid (PEDOT:PSS) as a hole injection layer (HIL); Ir(CF3BNO)(2)-pop based PHOLEDs perform better with an EQE of 23% and a current efficiency of 82 cd A(-1) than Ir(BNO)(2)-pop based PHOLEDs. In addition, to improve device operational lifetime, a crosslinkable HIL material, 9,9'-(cyclohexane-1,1-diylbis(4,1-phenylene))bis(N-phenyl-N-(4-(((4-vinylbenzyl)oxy)methyl)phenyl)-9H-carbazol-3-amine) (CPCzDPAX-1) is designed and synthesized. Device operational lifetimes of Ir(CF3BNO)(2)-pop and Ir(BNO)(2)-pop PHOLEDs incorporating the CPCzDPAX-1 HIL show 14-fold and 6-fold improvement, compared to the corresponding devices incorporating the PEDOT:PSS HIL. To the best of the authors' knowledge, this is the best device lifetime performance by using the combination of new Ir(III) complexes and HIL materials for solution-processed green PHOLEDs.

引用

页数：8

共 46 条

[1] Thermally cross-linkable host materials for enabling solution-processed multilayer stacks in organic light-emitting devices [J].