Deep-Blue Phosphorescent Ir(III) Complexes with Light-Harvesting Functional Moieties for Efficient Blue and White PhOLEDs in Solution-Process

被引：79

作者：

Sarada, Ganguri ^{[1
]}

Cho, Woosum ^{[1
]}

Maheshwaran, Athithan ^{[1
]}

Sree, Vijaya Gopalan ^{[1
]}

Park, Ho-Yeol ^{[1
]}

Gal, Yeong-Soon ^{[2
]}

Song, Myungkwan ^{[3
]}

Jin, Sung-Ho ^{[1
]}

机构：

[1] Pusan Natl Univ, Inst Plast Informat & Energy Mat, Grad Dept Chem Mat, Dept Chem Educ, Busandaehakro 63-2, Busan 46241, South Korea

[2] Kyungil Univ, Coll Engn, Polymer Chem Lab, Gyongsan 712701, South Korea

[3] Korea Inst Mat Sci, Adv Funct Thin Films Dept, Surface Technol Div, 797 Changwondaero, Chang Won 51508, Gyeongnam, South Korea

来源：

ADVANCED FUNCTIONAL MATERIALS | 2017年 / 27卷 / 27期

基金：

新加坡国家研究基金会;

关键词：

blue iridium complexes; intramolecular energy transfer; light-harvesting moieties; organic light-emitting diodes; photoluminescence efficiency; EXCIPLEX-TYPE HOST; HIGH TRIPLET ENERGY; SINGLE-LAYER BLUE; TURN-ON VOLTAGE; EMITTING-DIODES; IRIDIUM COMPLEXES; ANCILLARY LIGAND; ROLL-OFF; ELECTROPHOSPHORESCENT DEVICES; EXCITON CONFINEMENT;

D O I：

10.1002/adfm.201701002

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The photoluminescence (PL) efficiency of emitters is a key parameter to accomplish high electroluminescent performance in phosphorescent organic light-emitting diodes (PhOLEDs). With the aim of enhancing the PL efficiency, this study designs deep-blue emitting heteroleptic Ir(III) complexes (tBuCN-FIrpic, tBuCN-FIrpic-OXD, and tBuCN-FIrpic-mCP) for solution-processed PhOLEDs by covalently attaching the light-harvesting functional moieties (mCP-Me or OXD-Me) to the control Ir(III) complex, tBuCN-FIrpic. These Ir(III) complexes show similar deep-blue emission peaks around 453, 480 nm (298 K) and 447, 477 nm (77 K) in chloroform. tBuCN-FIrpic-mCP demonstrates higher light-harvesting efficiency (142%) than tBuCN-FIrpic-OXD (112%), relative to that of tBuCN-FIrpic (100%), due to an efficient intramolecular energy transfer from the mCP group to the Ir(III) complex. Accordingly, the monochromatic PhOLEDs of tBuCN-FIrpic-mCP show higher external quantum efficiency (EQE) of 18.2% with one of the best blue coordinates (0.14, 0.18) in solution-processing technology. Additionally, the two-component (deep-blue: yellow-orange), single emitting layer, white PhOLED of tBuCN-FIrpic-mCP shows a maximum EQE of 20.6% and superior color quality (color rendering index (CRI) = 78, Commission Internationale de L'Eclairage (CIE) coordinates of (0.353, 0.352)) compared with the control device containing sky-blue: yellow-orange emitters (CRI = 60, CIE coordinates of (0.293, 0.395)) due to the good spectral coverage by the deep-blue emitter.

引用

页数：8

共 53 条

[1] Design of high triplet energy electron transporting material for exciplex-type host: Efficient blue and white phosphorescent OLEDs based on solution processing [J].