Solution P Rocessed Highperformance White O Rganic L Ight E Mitting D Iodes And R Elated M Aterials

White organic light-emitting diodes(WOLED) featuring light in weight, flexible, energy-saving, ease of large-area fabrication, and bio-friendly diffusive warm light, have been generally recognized as the most promising candidate for next generation lighting technique, and even commercial lighting panel models have emerged. In this thesis, we put forward some methods to solve the issues faced with solution processed WOLED, in order to promote the industrialization of OLED lighting.For the instable electroluminescence spectrum of the two-component WOLED using PVK as the host, we fabricated an unique device structure as follows: ITO/PEDOT:PSS(35 nm)/(PVK: OXD-7: FIrpic(7:3:1)): wt% Ir(bt)2(acac)(55 nm)/TPBI(35 nm)/Ca:Ag, and then we optimized the doping content of Ir(bt)2(acac). Our device shows stable emission under the applied voltages ranging from 5-11 V, maximum brightness of around 50000 cd/m2, high efficiency with the maximum current efficiency of 25.5 cd/A. What’s more, it also performs high CRI value of 72, makes it the best values ever reported before.As to the balanced consideration problems between color quality and EL efficiency, we used a novel triphenylamine derivative named DTPAFB as our small molecular host, which pessess excellent photophysical properties. Further combining the newly developed phosphorescent materials with the common materials, we got a series of binary BO complementary color WOLED, RGB three-component WOLED, RGBO four primary color WOLED. The RGBO device, which exihibits the best performance, possess a total power efficiency reaches 33.6 lm/W, as well as a high CRI of 83, mediate CCT, warm and soft to human eye. This kind of work will provide a good guide for further material-choosing and WOLEDs fabrication.Warm lighting sources are preferred for physiologically-friendly illumination due to their low suppression of melatonin secretion. As there is still a mumber of challenges to the color quality and the stability of the EL spectrum for solution processed warm WOLED, We tried to fabricate low-CCT devices using a novel carbazole derivative as host. Finally we found that our four primary color device shows a CCT less than 2500 K and exactly stable electroluminescence spectrum in a brightness of about 100-10000 cd/m2, with a high CRI of 83. Moreover, these devices exhibit a peak current efficiency of 18.0 cd/A, which is comparable with incandescent bulbs.