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P‐211: High Quantum Efficiency of New Deep‐Blue EML Materials in OLED
Author(s) -
Kim SooKang,
Park YoungIl,
Park JongWook,
Jaung JaeYun
Publication year - 2008
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 - 10.1889/1.3069592
Subject(s) - oled , quantum efficiency , deep blue , materials science , optoelectronics , fluorescence , luminance , doping , blue light , optics , photochemistry , nanotechnology , chemistry , physics , layer (electronics)
We investigated new deep blue emitting materials including a novel side group such as CB‐203. CB‐203 shows relatively 40% increased PL quantum efficiency and higher Tg of 30°C compared to MADN. It exhibits high External Quantum Efficiency (EQE) of 7.18% that is two times bigger than MADN's, which is the best efficiency in case of non‐doped blue fluorescence OLED device to our knowledge. And deep blue emitting materials with a new core structure (CB‐301) have been synthesized. CB‐301 exhibit excellent blue fluorescence properties. Undoped OLED devices using CB‐301 as blue emitters was found to deep blue CIE value (0.154, 0.078) and exhibit high luminance efficiencies of 2.01cd/A at 10 mA/cm 2 .