10:00 AM - 10:15 AM
[OLED1-4L] Improvement of Performance and Color Stability of Solution-Processed OLED by Controlling Recombination Zone
solution-processed OLEDs, recombination zone, color stability, interface mixing
The recombination region is found on the hole transport layer/emitting layer side when using a relatively high electron mobility host material. By the way, in this case, the electroluminescence spectrum becomes broader as the driving voltage increases. High field-dependence for electron mobility of host material and electric field-induced quenching of excited state would be responsible for a color instability. On the contrary, the well-designed device utilizing host material with high hole mobility resulted in well-controlled recombination zone which is far away from the critical interface mixing zone. With this device, we obtain improved performance as well as much improved color stability.