采用结构为 LiF/Al/F4-TCNQ/NPB 的电荷产生层,制备出了双发光单元叠层有机电致发光器件(OLED：Organic Light Emitting Device).通过对比实验发现当 F4-TCNQ 层的厚度为8 nm、Al 层的厚度为5 nm 时,电荷产生层产生电荷的能力较强且具有良好的透光率.基于此,本文制备了发光层为 CBP：6％Ir(ppy)3的叠层 OLED,通过与单发光单元OLED 的性能比较发现：采用 LiF/Al/F4-TCNQ/NPB 作为电荷产生层制备的叠层 OLED 的最大电流效率与功率效率分别为51.6 cd/A、28.4 lm/W,为单发光单元 OLED 的2.16倍、1.8倍,此外采用这种结构的电荷产生层有效解决了叠层 OLED 由于工作电压高而导致功率效率并未得到提升的问题；另一方面,采用有机材料 F4-TCNQ 代替传统无机金属氧化物作为电荷产生层中的电荷产生部分,能够避免无机金属氧化物高温升华对 Al 层薄膜的破坏,提升了器件的效率并且降低了器件的 roll-off 现象.
A novel type of tandem organic light emitting device (OLED)was demonstrated by emplo-ying LiF/Al/F4-TCNQ/NPB as charge generation layer (CGL).By contrast experiment,it is sugges-ted that the optimum thickness of F4-TCNQ and Al in CGL is 8 nm and 5 nm,respectively,which exhibits the good ability of generating charges and higher optical transmittance.Based on the optimized structure of CGL,we fabricated the tandem OLED with the emission layer of CBP:6%Ir(ppy)3 .By comparing the device performance of the tandem OLED and conventional single OLED,it was found that the highest current efficiency and power efficiency were 5 1.6 cd/A and 28.4 lm/W,which was 2.1 6 times and 1.8 times as high as that of single OLED,respectively.In conclusion,the tandem OLED with the CGL of LiF/Al/F4-TCNQ/NPB can improve the power efficiency of OLED.In addi-tion,replacing conventional inorganic metal oxide with organic material of F4-TCNQ in CGL can avoid the destruction of film formation of Al layer, inducing in improving in performance and weakening the efficiency roll-off phenomenon.
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