Chin. Phys. Lett.  2016, Vol. 33 Issue (03): 038501    DOI: 10.1088/0256-307X/33/3/038501
CROSS-DISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY |
Highly Efficient Greenish-Yellow Phosphorescent Organic Light-Emitting Diodes Based on a Novel 2,3-Diphenylimidazo[1,2-a]Pyridine Iridium(III) Complex
Jun Sun1**, Min Xi1, Zi-Sheng Su2, Hai-Xiao He1, Mi Tian1, Hong-Yan Li1, Hong-Ke Zhang1, Tao Mao1, Yu-Xiang Zhang1
1Xi'an Manareco New Materials Co., Ltd. Xi'an 710077
2State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033
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Jun Sun, Min Xi, Zi-Sheng Su et al  2016 Chin. Phys. Lett. 33 038501
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Abstract A cyclometalated greenish-yellow emitter 2,3-diphenylimidazo[1,2-a]pyridine iridium(III) complex is successfully synthesized and used to fabricate phosphorescent organic light-emitting diodes. The optimized device exhibits a greenish-yellow emission with the peak at 523 nm and a strong shoulder at 557 nm, corresponding to Commission Internationale de l'Eclairage coordinates of (0.38, 0.58). The full width at half maximum of the device is 93 nm, which is broader than the fac-tris(2-phenylpyridine)iridium [Ir(ppy)$_{3}$] based reference device of 78 nm. Meanwhile, a maximum current efficiency of 62.6 cd/A (47.5 lm/W) is obtained. This result is higher than a maximum current efficiency of 54.8 cd/A (43 lm/W) of the Ir(ppy)$_{3}$ based device. The results indicate that this new iridium complex may have potential applications in fabricating high color rendering index white organic light emitting diodes.
Received: 19 August 2015      Published: 31 March 2016
PACS:  85.60.Jb (Light-emitting devices)  
  42.15.Eq (Optical system design)  
  85.60.Pg (Display systems)  
  42.79.Bh (Lenses, prisms and mirrors)  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/33/3/038501       OR      https://cpl.iphy.ac.cn/Y2016/V33/I03/038501
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Jun Sun
Min Xi
Zi-Sheng Su
Hai-Xiao He
Mi Tian
Hong-Yan Li
Hong-Ke Zhang
Tao Mao
Yu-Xiang Zhang
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