Unusual phosphorescence characteristics of Ir(ppy)3 in a solid matrix at low temperatures

Kenichi Goushi; Yuichiro Kawamura; Hiroyuki Sasabe; Chihaya Adachi

doi:10.1143/JJAP.43.L937

Unusual phosphorescence characteristics of Ir(ppy)₃ in a solid matrix at low temperatures

Kenichi Goushi, Yuichiro Kawamura, Hiroyuki Sasabe, Chihaya Adachi

Research output: Contribution to journal › Article › peer-review

58 Citations (Scopus)

Abstract

We observed unusual radiative decay characteristics of a (fac-tris(2-phenylpyridine)iridium [Ir(ppy)₃]) triplet-excited state doped into 4,4′-N, N′-dicarbazole-biphenyl (CBP) and polymethylmethacrylate (PMMA) host matrices. From a measurement of the temperature dependence on the phosphorescence intensity and the lifetime of Ir(ppy)₃ in these hosts, we observed that phosphorescence intensities are independent of temperature, while the lifetimes significantly increase at temperatures below T ∼ 50 K. These results lead us to conclude that the non-radiative transition rate (k_nr) from the triplet excited state is very small compared with the radiative transition rate (k_r) and that the phosphorescence quantum yield (ø_PH) is nearly 100% even at room temperature. Based on our experimental results, we propose a possible decay mechanism to rationalize the characteristic temperature dependence on the transient phosphorescence.

Original language	English
Pages (from-to)	L937-L939
Journal	Japanese Journal of Applied Physics, Part 2: Letters
Volume	43
Issue number	7 A
DOIs	https://doi.org/10.1143/JJAP.43.L937
Publication status	Published - Jul 1 2004
Externally published	Yes

All Science Journal Classification (ASJC) codes

Engineering(all)
Physics and Astronomy (miscellaneous)
Physics and Astronomy(all)

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10.1143/JJAP.43.L937

Cite this

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title = "Unusual phosphorescence characteristics of Ir(ppy)3 in a solid matrix at low temperatures",

abstract = "We observed unusual radiative decay characteristics of a (fac-tris(2-phenylpyridine)iridium [Ir(ppy)3]) triplet-excited state doped into 4,4′-N, N′-dicarbazole-biphenyl (CBP) and polymethylmethacrylate (PMMA) host matrices. From a measurement of the temperature dependence on the phosphorescence intensity and the lifetime of Ir(ppy)3 in these hosts, we observed that phosphorescence intensities are independent of temperature, while the lifetimes significantly increase at temperatures below T ∼ 50 K. These results lead us to conclude that the non-radiative transition rate (knr) from the triplet excited state is very small compared with the radiative transition rate (kr) and that the phosphorescence quantum yield ({\o}PH) is nearly 100% even at room temperature. Based on our experimental results, we propose a possible decay mechanism to rationalize the characteristic temperature dependence on the transient phosphorescence.",

author = "Kenichi Goushi and Yuichiro Kawamura and Hiroyuki Sasabe and Chihaya Adachi",

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T1 - Unusual phosphorescence characteristics of Ir(ppy)3 in a solid matrix at low temperatures

AU - Goushi, Kenichi

AU - Kawamura, Yuichiro

AU - Sasabe, Hiroyuki

AU - Adachi, Chihaya

PY - 2004/7/1

Y1 - 2004/7/1

N2 - We observed unusual radiative decay characteristics of a (fac-tris(2-phenylpyridine)iridium [Ir(ppy)3]) triplet-excited state doped into 4,4′-N, N′-dicarbazole-biphenyl (CBP) and polymethylmethacrylate (PMMA) host matrices. From a measurement of the temperature dependence on the phosphorescence intensity and the lifetime of Ir(ppy)3 in these hosts, we observed that phosphorescence intensities are independent of temperature, while the lifetimes significantly increase at temperatures below T ∼ 50 K. These results lead us to conclude that the non-radiative transition rate (knr) from the triplet excited state is very small compared with the radiative transition rate (kr) and that the phosphorescence quantum yield (øPH) is nearly 100% even at room temperature. Based on our experimental results, we propose a possible decay mechanism to rationalize the characteristic temperature dependence on the transient phosphorescence.

AB - We observed unusual radiative decay characteristics of a (fac-tris(2-phenylpyridine)iridium [Ir(ppy)3]) triplet-excited state doped into 4,4′-N, N′-dicarbazole-biphenyl (CBP) and polymethylmethacrylate (PMMA) host matrices. From a measurement of the temperature dependence on the phosphorescence intensity and the lifetime of Ir(ppy)3 in these hosts, we observed that phosphorescence intensities are independent of temperature, while the lifetimes significantly increase at temperatures below T ∼ 50 K. These results lead us to conclude that the non-radiative transition rate (knr) from the triplet excited state is very small compared with the radiative transition rate (kr) and that the phosphorescence quantum yield (øPH) is nearly 100% even at room temperature. Based on our experimental results, we propose a possible decay mechanism to rationalize the characteristic temperature dependence on the transient phosphorescence.

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IS - 7 A

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Unusual phosphorescence characteristics of Ir(ppy)₃ in a solid matrix at low temperatures

Abstract

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