Deep blue light-emitting diode based on high molecular weight poly(9,9-dioctylfluorene) with high efficiency and color stability

作者：Tseng Shin Rong; Li Shiuan Yi; Meng Hsin Fei^*; Yu Yi Hsiang; Yang Chia Ming; Liao Hua Hsien; Horng Sheng Fu; Hsu Chian Shu

来源：Organic Electronics, 2008, 9(3): 279-284.

DOI：10.1016/j.orgel.2007.11.003

• polymer light-emitting diodes
• blocking layer
• molecular weight
• deep blue
• stability

A highly efficient deep blue polymer light-emitting diode based on poly(9,9-dioctylfluorene) is demonstrated. The performance is found to increase significantly with the molecular weight. Two different molecular weights are compared, one is 71,000 and the other is 365,000. The electroluminescent efficiency and color stability are improved by slightly doping hole traps into the emission layer and bilayer structure. The maximum efficiency is 3.8 cd/A with the corresponding external quantum efficiency of 3.7% at deep blue with Commission Internationale de L'Eclairage (CIE) coordinate at (0.15, 0.09). Stable blue emission is maintained up to 6600 cd/m(2) without growth of green shoulder in emission spectrum.

• 出版日期2008-6
• 单位清华大学