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Citation: DING Guo-Hua, JING Shu-Ping, XU Zhao-Wu, XU Zhong-Yu, TIAN He, GAO Jia, MA Dong-Ge. Synthesis and Characterization of Tris-cyclometalated Iridium Complexes for Orange-Red Electrophosphorescence[J]. Chinese Journal of Applied Chemistry, ;2005, 22(5): 502-506. shu

Synthesis and Characterization of Tris-cyclometalated Iridium Complexes for Orange-Red Electrophosphorescence

DING Guo-Hua ^a,c ,
JING Shu-Ping ^a ,
XU Zhao-Wu ^a ,
XU Zhong-Yu ^a ,
TIAN He ^a,, ,
GAO Jia ^b ,
MA Dong-Ge ^b

1.
a Institute of Fine Chemicals, East China University of Science & Technology, Shanghai 200237;
2.
b State Key Laboratory of Polymer Physics and Chemistry, Changchun Insititute of Applied Chemistry, Chinese Academy of Sciences, Changchun;
3.
c Department of Material & Chemical Engineering, Guilin University of Technology, Guilin

Corresponding author: TIAN He,
Received Date: 16 August 2004
Available Online: 30 December 2004
Fund Project: 上海市科委基金资助项目(04dz05102) (04dz05102)

The present paper deals with the preparation and characterization of new tris-cyclometalated iridium complexes with p-substituted-2-phenylbenzothiazol ligands.The device performance was tested with a general OLED architecture of ITO (indium tin oxide)/poly (3,4-ethylenedioxythiophene)(PEDOT)/Ir (bpmp)₃/Ca/Al,where PEDOT was used as the hole transporting layer and Ir-complex as the emissive layer.The Orange-red electrophosphorescence (emission peak at 550~650 nm) turned at around 5 V,with a maximum brightness of 20 cd/m² at 19 V.Both the current efficiency (4×10^-3 cd/A) and the power efficiency (9×10^-4 lm/W)) were low due to the triplet-triplet annihilation and concentration quenching arising from strong bimolecular interactions when only using Ir-complex as the emissive layer.Further optimization of OLED performance can be expected by blending conjugated polymers with Ir-complexes and by better engineering of the device structure.
- electrophosphorescence,
- iridium complex,
- benzothiazole derivative,
- optoelectronic device
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