高效率有机蓝光和白光电致发光器件

以蓝光材料FIrpic同时掺杂空穴传输层TCTA和电子传输层TPBI,制备了具有双发光层的高效率蓝光器件(D-BOLED),D-BOLED最大发光效率达23.4 cd/A,比单发光层蓝光器件(S-BOLED)提高了约36.8%.这是因为双发光层结构能够更有效地利用扩散到激子复合界面两边载流子传输层的三线态激子.结合基于...

Study on Efficient Blue and White Organic Light-emitting Devices

We have demonstrated efficient blue electrophosphorescent organic light-emitting diodes (PHOLEDs) with double light-emitting layers (D-BOLED), by doping both hole and electron transport layers with iridium(Ⅲ) bis picolinate (FIrpic), simultaneously. The D-BOLED showed a peak efficiency of 23.4 cd/A, which was improved about 36.8% compared to the conventional blue PHOLEDs with a single light-emitting layer (S-BOLED), by doping either hole or electron transport layer with FIrpic. We have attributed this improvement mainly to that the D-BOLED can efficiently use the triplet excitons that were generated by carrier recombination at the interface of FIrpic ∶ TCTA/ FIrpic ∶ TPBI and diffused into FIrpic doped charge transport layers and subsequently decayed radiatively on FIrpic sites.Combining a DCJTB doped color conversion layer with the D-BOLED, we have achieved a WOLEDs with a peak efficiency of 10.7 cd/A and CIE coordinate of (0.33, 0.33).