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39.4: Highly Efficient Fluorescent Blue OLEDs with Efficiency‐enhancement Layer
Author(s) -
Kawamura Masahiro,
Kawamura Yuichiro,
Mizuki Yumiko,
Funahashi Masakazu,
Kuma Hitoshi,
Hosokawa Chishio
Publication year - 2010
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1889/1.3500528
Subject(s) - luminance , oled , fluorescence , optoelectronics , materials science , layer (electronics) , exciton , quantum efficiency , electron , transient (computer programming) , optics , nanotechnology , physics , computer science , quantum mechanics , operating system
We found a new device structure which has an efficiency‐ enhancement layer between emitting layer and electron transporting layer. We applied the structure to a pure blue fluorescent device with a CIE1931 coordinate of (0.14, 0.12) and successfully obtained very high EQE of over 10% with low driving voltage of 3.7 V at 10 mA/cm 2 and long lifetime of 10,000 hrs at an initial luminance of 1,000 cd/m 2 . Results of transient EL measurements indicated the contribution of triplet excitons to the high EQE.