期刊
CHEMISTRY OF MATERIALS
卷 26, 期 7, 页码 2368-2373出版社
AMER CHEMICAL SOC
DOI: 10.1021/cm5006086
关键词
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资金
- National Basic Research Program of China [2006CB601103]
- National Natural Science Foundation of China (NNSFC) [20971006, 90922004, 21201011, 91127001]
- Specialized Research Fund for the Doctoral Program of Higher Education [20120001120116]
- Universal Display Corporation
Phosphorescent copper(I) complexes show great promise as emitters in organic light-emitting diodes (OLEDs). However, most copper(I) complexes are neither soluble nor stable toward sublimation and, hence, not amenable to the typical methods to fabricate OLEDs. In this work, a compound 3-(carbazol-9-yl)-5-((3-carbazol-9-yl)phenyl)pyridine (CPPyC) was designed as both a good ligand and host matrix. Codeposition of CPPyC and copper iodide (Cul) gives luminescent films with photoluminescent quantum yields (PLQY) as high as 100%. A dimeric copper(1) complex Cu2I2(CPPyC)(4) is formed in the thin film, characterized by X-ray absorption spectroscopy. A series of simple, highly efficient green-emitting OLEDs were demonstrated by using the codeposited film as an emissive layer. A device comprised of only CPPyC and Cul gave an external quantum efficiency (EQE) of 12.6% (42.3 cd/A) at 100 cd/m(2), while a device with tailored hole and electron transporting layers gave an efficiency of 15.7% (51.6 cd/A) at the same brightness.
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