Browsing by Author "Lee, Chun Sing"

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High efficiency and small roll-off electrophosphorescence from a new iridium complex with well-matched energy levels
(2008-02-18)
Gao, Zhi Qiang
;
Mi, Bao Xiu
;
Tam, Hoi Lam
;
Cheah, Kok Wai
;
Chen, Chin Hsin
Phenylpyridazine ligands coordinating to the iridium(III) atom yield a thermally stable (5 % weight loss at 439 degrees C) homoleptic iridium complex with a high phosphorescent quantum yield (0.32 at room temperature). This material has well-matched energy levels with the host, and highly efficient electrophosphorescence (52 cd A(-1); see figure) with a small roll-off (23 % at 70 mA cm(-2)) in device efficiency is achieved.
Strong Luminescent Iridium Complexes with (CN)-N-boolean AND=N Structure in Ligands and Their Potential in Efficient and Thermally Stable Phosphorescent OLEDs
(2009-01-19)
Mi, Boo Xiu
;
Wang, Peng Fei
;
Gao, Zhi Qiang
;
Lee, Chun Sing
;
Lee, Shuit Tong
Homoleptic iridium complexes with (CN)-N-boolean AND=N type ligands, i.e., 1,4-bis (phenyl) phthalazine (BPPa) and 3,6-bis(phenyl)pyridazine (BPPya), are strong phosphorescents, easy to synthesize, and thermally stable, thus having great potential in optical electronic applications, as demonstrated in lr(BPPa)(3)-based OLED devices. A quantum chemistry study shows that (CN)-N-boolean AND=N type ligands can bond to Ir more strongly.
Strong Luminescent Iridium Complexes with C(boolean AND)N=N Structure in Ligands and Their Potential in Efficient and Thermally Stable Phosphorescent OLEDs
(2009-01-19)
Mi, Boo Xiu
;
Wang, Peng Fei
;
Gao, Zhi Qiang
;
Lee, Chun Sing
;
Lee, Shuit Tong
Homoleptic iridium complexes with C(boolean AND)N=N type ligands, i.e., 1,4-bis (phenyl) phthalazine (BPPa) and 3,6-bis(phenyl)pyridazine (BPPya), are strong phosphorescents, easy to synthesize, and thermally stable, thus having great potential in optical electronic applications, as demonstrated in lr(BPPa)(3)-based OLED devices. A quantum chemistry study shows that C(boolean AND)N=N type ligands can bond to Ir more strongly.