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A Color Stable Blue Light-Emitting Device Using a Pyrazolo[3,4-b]Quinoline Derivative as an Emitter

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8 Author(s)
Linping Mu ; Key Lab. of Luminescence & Opt. Inf., Beijing Jiaotong Univ., Beijing ; Zhiqun He ; Jing Wang ; Guanbao Hui
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A color stable and pure blue multilayered light-emitting device is obtained via suppressing voltage-dependent color change. Photophysical properties of a blue fluorescent organic compound 1-phenyl-3,4-dimethyl-1H-pyrazolo[3,4-b]-quinoline (PAQ5) are investigated; its highest occupied and lowest unoccupied molecular orbital levels are also measured. A multilayer electroluminescent device is fabricated using PAQ5 as an emitter dopant in a polymer matrix. The dopant has several functions in balancing injection and transport as well as bright blue light emission. The multilayered device using PAQ5 dopant substantially reduces voltage-dependent color changes, enhances the brightness of the device, and stabilizes general performance of the device. A color stable and pure blue electroluminescence with Commission Internationale de L'Eclairage (CIE) color coordinates of (x,y)=(0.168,0.100) is achieved.

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IEEE Photonics Technology Letters  (Volume:20 ,  Issue: 21 )