期刊
ACS APPLIED MATERIALS & INTERFACES
卷 5, 期 3, 页码 965-971出版社
AMER CHEMICAL SOC
DOI: 10.1021/am3026097
关键词
organic light-emitting diode; white; nondoped emissive layer; ultrathin emissive layer; interface doping; simple
资金
- Science Fund for Creative Research Groups of NSFC [20921061]
- National Natural Science Foundation of China [50973104, 60906020, 61036007, 60937001]
- Ministry of Science and Technology of China (973 program) [2009CB623604, 2009CB930603]
- Foundation of Jilin Research Council [201105028, 20090127]
In this paper, highly efficient and simple monochrome blue, green, orange, and red organic light emitting diodes (OLEDs) based on ultrathin nondoped emissive layers (EMLs) have been reported. The ultrathin nondoped EML was constructed by introducing a 0.1 nm thin layer of pure phosphorescent dyes between a hole transporting layer and an electron transporting layer. The maximum external quantum efficiencies (EQEs) reached 17.1%, 20.9%, 17.3%, and 19.2% for blue, green, orange, and red monochrome OLEDs, respectively, indicating the universality of the ultrathin nondoped EML for most phosphorescent dyes. On the basis of this, simple white OLED structures are also demonstrated. The demonstrated complementary blue/orange, three primary blue/green/red, and four color blue/green/orange/red white OLEDs show high efficiency and good white emission, indicating the advantage of ultrathin nondoped EMLs on constructing simple and efficient white OLEDs.
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