Citation: WANG Jian, ZHANG Fu-Jun, XU Zheng, WANG Yong-Sheng. Luminescence Characteristics of Blue Emission Phosphorescent Material Firpic[J]. Acta Physico-Chimica Sinica, ;2012, 28(04): 949-956. doi: 10.3866/PKU.WHXB201201163 shu

Luminescence Characteristics of Blue Emission Phosphorescent Material Firpic

1.
Key Laboratory of Luminescence and Optical Information, Ministry of Education, Beijing Jiaotong University, Beijing 100044, P. R. China

Received Date: 23 November 2011
Available Online: 16 January 2012
Fund Project: 国家重点基础研究发展规划(973) (2010CB327704) (973) (2010CB327704) 国家自然科学基金(10804006, 60576016) (10804006, 60576016) 国家杰出青年基金(60825407) (60825407) 北京市自然科学基金(1102028) (1102028) 高等学校学科创新引智计划(B08002) (B08002) 高等学校基本科研业务基金(2011JBM123, 2010JBZ003) (2011JBM123, 2010JBZ003)

The luminescent properties of bis[(4,6-difluorophenyl)-pyridinato-N,C²']c(picolinate)iridium(III) (FIrpic) dependence on the doping concentrations and different annealing treatments were investigated. The color of emission from thin films and organic light emitting diodes (OELDs) could be adjusted from blue to yellow-green by controlling the FIrpic doping concentration. There was od spectral overlap from 440 to 480 nm between the FIrpic photoluminescence (PL) spectra and its absorption spectra. The 476 nm emission intensity decreased as the FIrpic doping concentration increased, and this effect could be attributed to FIrpic self-absorption. The PL and electroluminescence (EL) spectra were measured under different excitation power densities and in different doping concentrations, respectively. The intensity of emission peak at 530 nm was enhanced as the excitation power density or FIrpic doping concentration increased. This suggests that the emission peak at 530 nm originates from the excimer emission between FIrpic molecules. The morphologies of the thin film and changes in the EL spectra were analyzed before and after annealing treatment. This demonstrated that FIrpic molecular aggregation promoted by annealing treatment could increase the intensity of excimer emission between FIrpic molecules. The emission color of OLEDs could be adjusted from blue to yellow-green by changing the FIrpic doping concentration, optimizing the device structure, and using annealing treatment on the devices.
- Organic light emitting diode,
- Phosphorescent material,
- Self-absorption,
- Excimer emission,
- Annealing
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