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We have demonstrated high-efficiency and color stable deep-blue organic light emitting diodes (OLED) using 4,4'-bis (9-ethyl-3-carbazovinylene)-1,1' -biphenyl doped in new blue host material as emitting layer. As host change of the doped blue emitter, blue OLED improved efficiency and exhibited color stability. The optimized blue OLED showed the peak external quantum efficiency of 4.72%, luminous...
We demonstrated the red phosphorescent organic light-emitting diodes with sensitizer, iridium(III) tris(2-phenylpyridine) [Ir(ppy)3]. The devices with sensitizer showed a significant improvement in a luminance and efficiency compared to those without sensitizer. Moreover, the electroluminescent (EL) spectra of devices with sensitizer show a similar emission peak with photoluminescent (PL) spectra...
A new series of the carbonylated arylpyridine derived iridium complexes were synthesized and their photophysical and electroluminescent properties were characterized. Multilayer devices with the configuration of ITO/2-TNATA (60 nm)/NPB(20 nm)/Ir complexes doped in CBP(30 nm)/BCP(10 nm)/Alq3(20 nm)/Liq(2 nm)/Al(100 nm) were fabricated. In the device employing complex 2 as dopant, the maximum luminance,...
A series of bis(diarylamino)stilbene derivatives with various aromatic system were synthesized via the Buchwald-Hartwig cross-coupling reaction. Multilayer devices with the configuration of ITO / NPB (700 ??) / ADN: blue dopants 1-5 (300 ??: 2 %) / Alq3 (300 ??) / Liq (10 ??) / Al were fabricated. Among the molecules, the devices using 4,4'-bis (9,9-diethylfluoren-2-yl-3,5-di-tertbutylphenylamino)...
The authors have demonstrated mixed spacer (MS) effect of hybrid white organic light-emitting diodes (HWOLEDs) for reduced efficiency roll-off using fluorescent blue emitter and phosphorescent red emitter. The optimized HWOLED with MS ratio (1:3) which was 4,4',4"tris (N-carbazolyl) triphenylamine and bis-(2-methyl-8-quinolinolate)-4-(phenylphenolato)aluminium exhibited a maximum luminance of...
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