Bright hybrid white light-emitting quantum dot device with direct charge injection into quantum dot

• 作 者: 曹进 谢婧薇 魏翔 周洁 陈超平 王子兴 田哲圭
• 机 构: Key Laboratory of Advanced Display and System Applications,Ministry of Education,Shanghai University
• 出 处: Chinese Physics B
• 发表日期: 2016年12期
• 关键词: Bright lifetime brightness Internationale emitter excitation benzo blend normali

A bright white quantum dot light-emitting device(white-QLED) with 4-[4-(1-phenyl-1H-benzo[d]imidazol-2-yl)phenyl]-2- [3-(tri-phenylen-2-yl)phen-3-yl]quinazoline deposited on a thin film of mixed green/red-QDs as a bilayer emitter is fabricated. The optimized white-QLED exhibits a turn-on voltage of 3.2 V and a maximum brightness of 3660 cd/m~2@8 V with the Commission Internationale de l’Eclairage(CIE) chromaticity in the region of white light. The ultra-thin layer of QDs is proved to be critical for the white light generation in the devices. Excitation mechanism in the white-QLEDs is investigated by the detailed analyses of electroluminescence(EL) spectral and the fluorescence lifetime of QDs. The results show that charge injection is a dominant mechanism of excitation in the white-QLED.

A bright white quantum dot light-emitting device (white-QLED) with 4- [4- (1 -phenyl- 1H-benzo [d] imidazol- 2-yl) phen-3-yl] quinazoline deposited on a thin film of mixed green / red-QDs as a bilayer emitter was fabricated. The optimized white-QLED exhibited a turn-on voltage of 3.2 V and a maximum brightness of 3660 cd / m ~ 2 @ 8 V with the Commission Internationale de l’Eclairage (CIE) chromaticity in the region of white light. The ultra-thin layer of QDs is proved to be critical for the white light generation in the devices. in the white-QLEDs is investigated by the detailed analyzes of electroluminescence (EL) spectral and the fluorescence lifetime of QDs. The results show that charge injection is a dominant mechanism of excitation in white-QLED.