Iridium-Based High-Sensitivity Oxygen Sensors and Photosensitizers with   Ultralong Triplet Lifetimes

doi:10.1021/acsami.5b07860

CORC > 北京大学 > 化学与分子工程学院

	Iridium-Based High-Sensitivity Oxygen Sensors and Photosensitizers with Ultralong Triplet Lifetimes
	Jiang, Xinpeng ; Peng, Jiang ; Wang, Jianchun ; Guo, Xinyan ; Zhao, Dahui ; Ma, Yuguo
刊名	ACS APPLIED MATERIALS & INTERFACES
	2016
关键词	triplet energy transfer photosensitizer oxygen sensor triscyclometalated iridium triplet lifetime CYCLOMETALATED IR(III) COMPLEXES ANNIHILATION UP-CONVERSION RUTHENIUM(II) BIPYRIDINE COMPLEXES TRIDENTATE POLYPYRIDINE LIGANDS DELAYED FLUORESCENCE MATERIALS ROOM-TEMPERATURE LUMINESCENCE EXCITED-STATE PROCESSES ENERGY-TRANSFER PHOTODYNAMIC THERAPY METAL-COMPLEXES
DOI	10.1021/acsami.5b07860
英文摘要	The photophysics of a series of bichromophoric molecules featuring an intramolecular triplet energy transfer between a triscyclometalated iridium(III) complex and covalently linked organic group are studied. By systematically varying the energy gap (0.1-0.3 eV) between the donor (metal complex) and acceptor (pyrene unit), reversible triplet energy transfer processes with equilibrium constant K ranging from ca. 500 to 40 000 are established. Unique photophysical consequences of such large K values are observed. Because of the highly imbalanced forward and backward energy transfer rates, triplet excitons dominantly populate the acceptor moiety in the steady state, giving rise to ultralong luminescence lifetimes up to 1-4 ms. Because the triscyclometalated Ir and triplet pyrene groups both impart relatively small nonradiative energy loss, decent phosphorescence quantum yields (Phi = 0.1-0.6) are attained in spite of the exceptionally prolonged excited states. By virtue of such precious combination of long-lived triplet state and high Phi, these bichromophoric molecules can serve as highly sensitive luminescent sensors for detecting trace amount of O-2 and as potent photosensitizers for producing singlet oxygen even under low-oxygen content conditions.; National Natural Science Foundation [21222403, 51473003, 51573002]; Ministry of Science and Technology of China [2013CB933501]; SCI(E); ARTICLE; dhzhao@pku.edu.cn; ygma@pku.edu.cn; 6; 3591-3600; 8
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/438620]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	Jiang, Xinpeng,Peng, Jiang,Wang, Jianchun,et al. Iridium-Based High-Sensitivity Oxygen Sensors and Photosensitizers with Ultralong Triplet Lifetimes[J]. ACS APPLIED MATERIALS & INTERFACES,2016.
APA	Jiang, Xinpeng,Peng, Jiang,Wang, Jianchun,Guo, Xinyan,Zhao, Dahui,&Ma, Yuguo.(2016).Iridium-Based High-Sensitivity Oxygen Sensors and Photosensitizers with Ultralong Triplet Lifetimes.ACS APPLIED MATERIALS & INTERFACES.
MLA	Jiang, Xinpeng,et al."Iridium-Based High-Sensitivity Oxygen Sensors and Photosensitizers with Ultralong Triplet Lifetimes".ACS APPLIED MATERIALS & INTERFACES (2016).