红色磷光微腔有机电致发光器件的发光性能

Luminescence Properties of Red Phosphorescent Microcavity Organic Light-emitting Devices

制备了结构为G/DBR/ITO/Mo O3(1 nm)/Tc Ta(55 nm)/CBP∶Ir(piq)2acac(44 nm,6%)/TPBI(55nm)/Li F(1 nm)/Al(80 nm)的红色磷光微腔有机电致发光器件(MOLED),同时制作了无腔对比器件OLED,研究微腔结构对磷光器件发光性能的影响。研究发现,OLED的电致发光(EL)峰值为626 nm,半高全宽(FWHM)为92 nm;MOLED的发光峰值为628 nm,FWHM为42 nm,窄化了1/2。MOLED的最大亮度、最大电流效率、最大外量子效率(EQE)分别为121 000 cd/m2、27.8 cd/A和28.4%,OLED的最大亮度、最大电流效率、最大EQE分别为54 500 cd/m2、13.1 cd/A和16.6%。结果表明,微腔器件的发光性能与无腔器件相比得到了较大幅度的提升。

Red phosphorescent microcavity organic light-emitting device( MOLED) with structure of Glass / DBR / ITO / Mo O3( 1 nm) /Tc Ta( 55 nm) /CBP∶ Ir( piq)2acac( 44 nm,6%) / TPBI( 55 nm) /Li F( 1 nm) / Al( 80 nm) was fabricated. For comparison,an OLED without cavity also was fabricated. The effect of microcavity structure on luminescent properties of phosphorescent devices was studied. The electroluminescence( EL) spectrum peak of OLED is at 626 nm,and the full width at half maximum( FWHM) is 92 nm. The electroluminescence( EL) spectrum peak of MOLED is at628 nm,and the FWHM is 42 nm which is narrowed half compared with the 92 nm value. The micro cavity structure can narrow the luminescence spectrum of OLED and improve the colour purity.For MOLED,the maximum brightness,the maximum current efficiency,the maximum external quantum efficiency( EQE) are 121 000 cd / m2,27. 8 cd /A and 28. 4%,respectively. For OLED,its maximum brightness,current efficiency and external quantum efficiency are 54 500 cd / m2,13. 1cd / A and 16. 6%,respectively. Comparing with the no cavity device,the luminescence properties of microcavity device have been improved greatly.