白色有机发光器件及其稳定性

报道了一种稳定的白色有机薄膜电致发光器件.电流效率6cd/A,在电流密度20mA/cm²驱动下,亮度为1026cd/m²;最高亮度21200cd/m²,色度(x=0.32,y=0.40).该器件具有较平稳的效率电流关系,即具有弱的电流荧光猝灭.初始亮度100cd/m²下,半亮度寿命达22245h.

White Organic Light Emitting Diode and Its Stability

Three kinds of white organic light emitting devices (WOLED) were constructed:Cell-S, with a single-doped red dye in the light emitting layer(EML); Cell-D, with both red and blue dyes doped in a single EML(double-doped); Cell-T, with red and blue dyes doped in one EML and a green dye in another layer(triple-doped).The structure of these devices are as follows:Cell-S:CuPc(12nm)/NPB(40nm)/ADN:DCJTB(50nm)/Alq₃(12nm)/LiF(4nm)/Al; Cell-D:CuPc(12nm)/NPB(40nm)/ADN:DCJTB:TBPe(50nm)/Alq₃(12nm)/LiF(4nm)/Al; Cell-T:CuPc(12nm)/NPB(40nm)/ADN:DCJTB:TBPe(50nm)/Alq₃:C545(12nm)/LiF(4nm)/Al. Experimentals indicate that the Cell-T and Cell-D show much higher luminance and efficiency than that of Cell-S.The Cell-T achieves a current efficiency of 6cd/A and a power efficiency 3.11 lm/W, which is twice that of Cell-S, 1026cd/m² at driving current 20mA/cm² and maximum luminance 21200cd/m², In addition, it exhibits a flatcd/Avs. current density response, indicating a weak current induced fluorescence quenching. At the driving current 12mA/cm², at the initial luminance of 575cd/m², the half life is over 3862h for Cell-T, for an initial luminance of 100cd/m², the half life (t/2) is projected to be 22245h with a little change of EL spectrum before and after aging.