White organic light-emitting device with both phosphorescent and fluorescent emissive layers
.. Zhang Li-Juan(张丽娟), Hua Yu-Lin(华玉林), Wu Xiao-Ming(吴小明), Wang Yu(王宇), and Yin Shou-Geng(印寿根)
Laboratory of Display Materials and Photoelectric Devices, Ministry of Education; Key Laboratory of Photoelectric Materials and Devices of Tianjin, Institute of Material Physics, Tianjin University of Technology, Tianjin 300384, China
Abstract This paper reports the fabrication of novel white organic light-emitting device(WOLED) by using a high efficiency blue fluorescent dye $N$-(4-((E)-2-(6-((E)-4-(diphenylamino)styryl)naphthalen-2-yl)vinyl)phenyl)-$N$-phenylbenzenamine ($N$-BDAVBi) and a red phosphoresecent dye bis (1-(phenyl) isoquinoline) iridium (III) acetylanetonate (Ir(piq)$_{2}$(acac)). The configuration of the device was ITO/PVK:TPD/CBP: $N$-BDAVBi /CBP/ BALq: Ir(piq)$_{2}$(acac)/BCP/Alq$_{3}$/LiF:AL. By adjusting the proportion of the dopants ($N$-BDAVBi, Ir(piq)$_{2}$(acac)) in the light-emitting layer, white light with Commission Internationale de l'Eclairage (CIE) coordinates of (0.35, 0.35) and a maximum luminance of 25350cd/m$^{2}$ were obtained at an applied voltage of 22V. The WOLED exhibits maximum external quantum and current efficiency of 6.78% and 12cd/A respectively. By placing an undoped spacer CBP layer between the two light-emitting layers and using BCP as hole blocking layer, the colour stabilization slightly changed when the driving voltage increased from 6 to 22 V.
Received: 29 October 2007
Revised: 29 November 2007
Accepted manuscript online:
.. Zhang Li-Juan(张丽娟), Hua Yu-Lin(华玉林), Wu Xiao-Ming(吴小明), Wang Yu(王宇), and Yin Shou-Geng(印寿根) White organic light-emitting device with both phosphorescent and fluorescent emissive layers 2008 Chin. Phys. B 17 3097
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