Electroluminescent Performances of Red Phosphorescent Iridium Complexes with Carrier Groups

LIANG Ai-hui; DENG Xian-ping; ZHU Wei-guo

doi:10.3788/fgxb20143510.1246

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Electroluminescent Performances of Red Phosphorescent Iridium Complexes with Carrier Groups

更新时间：2020-08-12

- Electroluminescent Performances of Red Phosphorescent Iridium Complexes with Carrier Groups
- Chinese Journal of Luminescence Vol. 35, Issue 10, Pages: 1246-1251(2014)
- 作者机构：
  
  1. 江西师范大学化学化工学院,江西南昌,330022
  2. 湘潭大学化学学院,湖南湘潭,411105
- 作者简介：
- 基金信息：
- DOI：10.3788/fgxb20143510.1246
  CLC： O649;TN383+.1
- Received：05 June 2014，
  
  Revised：01 July 2014，
  
  Published：03 October 2014
- 稿件说明：
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梁爱辉, 邓先平, 朱卫国. 含载流子基团的红色磷光铱配合物的电致发光特性[J]. 发光学报, 2014,35(10): 1246-1251

LIANG Ai-hui, DENG Xian-ping, ZHU Wei-guo. Electroluminescent Performances of Red Phosphorescent Iridium Complexes with Carrier Groups[J]. Chinese Journal of Luminescence, 2014,35(10): 1246-1251
梁爱辉, 邓先平, 朱卫国. 含载流子基团的红色磷光铱配合物的电致发光特性[J]. 发光学报, 2014,35(10): 1246-1251 DOI： 10.3788/fgxb20143510.1246.

LIANG Ai-hui, DENG Xian-ping, ZHU Wei-guo. Electroluminescent Performances of Red Phosphorescent Iridium Complexes with Carrier Groups[J]. Chinese Journal of Luminescence, 2014,35(10): 1246-1251 DOI： 10.3788/fgxb20143510.1246.

摘要

将含载流子基团的铱配合物Ir-1或Ir-2掺杂到聚芴（PFO）和2-（4-二苯基）-5-（4-叔丁苯基）-1，3，4-噁二唑（PBD）中作为发光层，采用旋涂法制备电致发光器件。通过改变发光层中铱配合物的掺杂浓度，研究了不同掺杂比例对器件性能的影响。结果表明，当铱配合物的掺杂质量分数为2%时，器件的电致发光性能最好。和含苯基的Ir-1比较发现，以含空穴传输基团三苯胺的Ir-2为客体材料的器件性能更好，能够更有效地避免T-T猝灭，器件的最大流明效率为2.78 cdA

-1

，最大亮度为5 718 cdm

-2

。

Abstract

Polymer light-emitting diodes (PLEDs) with device structure of indium tin oxide (ITO)/poly(3

4-ethylenedioxylenethiophene):poly(styrenesulphonic acid) (PEDOT:PSS)/emissive layer/tris(8-hydroxyquinolinato)aluminum (Ⅲ) (Alq

)/lithium fluoride (LiF)/Al were fabricated by solution procedures to obtain highly efficient saturated red electrophosphorescence. In the emissive layer

the blends of poly(9

9-dioctylfluorene) (PFO) and 2-tert-butylphenyl-5-biphenyl-1

4-oxadiazole (PBD) were used as host materials (the mass fraction of PBD was 30%)

and the iridium complexes Ir-1 and Ir-2 were used as the guest materials. The electroluminescent properties were investigated by changing the doping mass fraction of the iridium complexes in the emissive layer from 1% to 8%. The luminous efficiencies of PLEDs with Ir-1 and Ir-2 enhance when the dopant mass fraction increases from 1% to 2%. A further increase of the dopant mass fraction from 2% to 8% results in a decrease of the maximum luminous efficiencies

as a result of the concentration quenching and triplet-triplet (T-T) annihilation. The highest luminous efficiency of 2.72 cdA

-1

using Ir-1 as dopant is obtained at the doping mass fraction of 2%

and the luminous efficiency reduces to 2.17 cdA

-1

at a higher current density of 100 mAcm

-2

. Contrastively

the device based on Ir-2 exhibits highest luminous efficiency of 2.78 cdA

-1

at doping mass fraction of 2%. In addition

the luminous efficiency still stays at 2.30 cdA

-1

as the current density rises to 100 mA cm

-2

. Compared to Ir-1 which containing phenyl group in its ancillary ligand

Ir-2 with triphenylamine-modified ancillary ligand displays better electroluminescent performances

probably due to the triphenylamine group has bigger steric hindrance which can efficiently suppress concentration quenching and T-T annihilation. This indicates that it is an effective method to develop highly efficient electrophosphorescent devices by introducing big steric hindrance and good charge transport group into the ancillary ligand of the iridium complex.

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