TY - JOUR
T1 - Blue to True-Blue Phosphorescent IrIII Complexes Bearing a Nonconjugated
Ancillary Phosphine Chelate
T2 - Strategic synthesis, photophysics, and device integration
AU - Chiu, Yuan-Chieh
AU - Chi, Yun
AU - Hung, Jui-Yi
AU - Cheng, Yi-Ming
AU - Yu, Ya-Chien
AU - Chung, Ming-Wen
AU - Lee, Gene-Hsiang
AU - Chou, Pi-Tai
AU - Chen, Chung-Chia
AU - Wu, Chung-Chih
AU - Hsieh, Hsi-Ying
PY - 2009/2/25
Y1 - 2009/2/25
N2 - We report the design and synthesis of IrIII complexes functionalized with substituted pyridyl cyclometalate or azolate chromophores, plus one newly designed nonconjugated phosphine chelate, which not only greatly restricts its participation in the lowest-lying electronic transition but also enhances the coordination strength. These two key factors lead to fine-tuning of the phosphorescence chromaticity toward authentic blue and simultaneously suppress, in part, the nonradiative deactivation. This conceptual design presents a novel strategy in achieving heretofore uncommon, high-efficiency blue and true-blue phosphorescence. The fabrication of the organic light-emitting devices (OLEDs) employing phosphorescent dopants [Ir(dfpbpy)2(P∧N)] (1b) and [Ir(fppz)2(P∧N)] (3) was successfully made, for which the abbreviations (dfpbpy)H, (fppz)H, and (P∧N)H represent 2-(4,6-difluorophenyl)-4-tert-butylpyridine, 3-(trifluoromethyl)-5-(2-pyridyl)pyrazole, and 5-(diphenylphosphinomethyl)-3-(trifluoromethyl)pyrazole, respectively. Of particular interest is the 3-doped OLEDs, which exhibit remarkable maximum efficiencies of 6.9%, 8.1 cd A−1, and 4.9 lm W−1, together with a true-blue chromaticity CIEx,y = 0.163, with 0.145 recorded at 100 cd m−2.
AB - We report the design and synthesis of IrIII complexes functionalized with substituted pyridyl cyclometalate or azolate chromophores, plus one newly designed nonconjugated phosphine chelate, which not only greatly restricts its participation in the lowest-lying electronic transition but also enhances the coordination strength. These two key factors lead to fine-tuning of the phosphorescence chromaticity toward authentic blue and simultaneously suppress, in part, the nonradiative deactivation. This conceptual design presents a novel strategy in achieving heretofore uncommon, high-efficiency blue and true-blue phosphorescence. The fabrication of the organic light-emitting devices (OLEDs) employing phosphorescent dopants [Ir(dfpbpy)2(P∧N)] (1b) and [Ir(fppz)2(P∧N)] (3) was successfully made, for which the abbreviations (dfpbpy)H, (fppz)H, and (P∧N)H represent 2-(4,6-difluorophenyl)-4-tert-butylpyridine, 3-(trifluoromethyl)-5-(2-pyridyl)pyrazole, and 5-(diphenylphosphinomethyl)-3-(trifluoromethyl)pyrazole, respectively. Of particular interest is the 3-doped OLEDs, which exhibit remarkable maximum efficiencies of 6.9%, 8.1 cd A−1, and 4.9 lm W−1, together with a true-blue chromaticity CIEx,y = 0.163, with 0.145 recorded at 100 cd m−2.
KW - IrIII complexes
KW - nonconjugated phosphine chelate
KW - OLEDs
KW - true-blue phosphorescence
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UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-84862833440&origin=recordpage
U2 - 10.1021/am800122n
DO - 10.1021/am800122n
M3 - RGC 21 - Publication in refereed journal
SN - 1944-8244
VL - 1
SP - 433
EP - 442
JO - ACS Applied Materials and Interfaces
JF - ACS Applied Materials and Interfaces
IS - 2
ER -