A novel white organic electroluminescent device with both phosphorescent and fluorescent dopants

作者：Zhang Li Juan; Hua Yu Lin^*; Wu Xiao Ming; Zhang Guo Hui; Wang Yu; Yin Shou Gen

来源：Acta Physica Sinica, 2008, 57(3): 1913-1917.

• phosphorescence
• exciton blocking
• white organic electroluminescent

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/NPB: Ir( piq)(2) (acac)/CBP/CBP: TBPe/BCP/Alq(3)/Mg: Ag/Ag in which Alq(3), NPB undoped), CBP( undoped) and BCP films functioned as electron transporting layer, hole transporting layer and exciton blocking layer, respectively. 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 ( TBPe, Ir( piq)2 ( acac) With a low turn-on voltage of 4.8 V,it shows a maximum luminance of 7500 cd/m(2) and external quantum efficiency of 1.24% at the driving voltage of 9 V. Pure white light with Commission Internationale de 1' Eclairage ( CIE) coordinates of(0.33 0.30) was obtained at an applied voltage of 15 V.

• 出版日期2008-3
• 单位天津理工大学