Open AccessA novel white organic electroluminescent device with both phosphorescent and fluorescent dopants
Author(s) -
Lijuan Zhang,
Hua Yang,
Xiaoming Wu,
Guohui Zhang,
Yu Wang,
Shougen Yin
Publication year - 2008
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.57.1913
Subject(s) - electroluminescence , materials science , dopant , phosphorescence , doping , fluorescence , optoelectronics , layer (electronics) , exciton , luminance , oled , chromaticity , analytical chemistry (journal) , optics , chemistry , nanotechnology , physics , organic chemistry , quantum mechanics
A double-layer white organic electroluminescent device was fabricated by using hole transporting material NPB doped with phosphoresecent dye Ir(piq)2(acac) as red emitting layer and CBP doped with fluorescent dye TBPe as blue emitting layer. The configuration of this device was ITO/NPB/NPBIr(piq)2(acac)/CBP/CBPTBPe/BCP/Alq3/MgAg/Ag in which Alq3NPB(undoped)CBP(undoped) and BCP films functioned as electron transporting layerhole transporting layer and exciton blocking layerrespectively. White emission was be successfully achieved from the device with good EL performance by adjusting the thicknessess of light-emitting layers and the proportion of the dopants (TBPeIr(piq)2(acac)). With a low turn-on voltage of 4.8Vit shows a maximum luminance of 7500cd/m2 and external quantum efficiency of 1.24% at the driving voltage of 9V. Pure white light with Commission Internationale de l'Eclairage (CIE) coordinates of(0.33 0.30)was obtained at an applied voltage of 15V.