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タイトル: Insight into the Thermal Quenching Mechanism for Y₃Al₅O₁₂:Ce³⁺ through Thermoluminescence Excitation Spectroscopy
著者: Ueda, Jumpei
Dorenbos, Pieter
Bos, Adrie J. J.
Meijerink, Andries
Tanabe, Setsuhisa  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-7620-0119 (unconfirmed)
著者名の別形: 上田, 純平
田部, 勢津久
発行日: 5-Nov-2015
出版者: American Chemical Society
誌名: Journal of Physical Chemistry C
巻: 119
号: 44
開始ページ: 25003
終了ページ: 25008
抄録: Y₃Al₅O₁₂(YAG):Ce³⁺ is the most widely applied phosphor in white LEDs (w-LEDs) because of strong blue absorption and efficient yellow luminescence combined with a high stability and thermal quenching temperature, required for the extreme operating conditions in high-power w-LEDs. The high luminescence quenching temperature (∼600 K) has been well established, but surprisingly, the mechanism for temperature quenching has not been elucidated yet. In this report we investigate the possibility of thermal ionization as a cause of this quenching process by measuring thermoluminescence (TL) excitation spectra at various temperatures. In the TL excitation (TLE) spectrum at room temperature there is no Ce³⁺:5d₁ band (the lowest excited 5d level). However, in the TLE spectrum at 573 K, which corresponds to the onset temperature of luminescence quenching, a TLE band due to the Ce³⁺:5d₁ excitation was observed at around 450 nm. On the basis of our observations we conclude that the luminescence quenching of YAG:Ce³⁺ at high temperatures is caused by the thermal ionization and not by the thermally activated cross over to the 4f ground state. The conclusion is confirmed by analysis of the positions of the 5d states of Ce³⁺ relative to the conduction band in the energy band diagram of YAG:Ce³⁺.
著作権等: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of Physical Chemistry C, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.jpcc.5b08828.
The full-text file will be made open to the public on 09 October 2016 in accordance with publisher's 'Terms and Conditions for Self-Archiving'.
この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。
This is not the published version. Please cite only the published version.
URI: http://hdl.handle.net/2433/231974
DOI(出版社版): 10.1021/acs.jpcc.5b08828
出現コレクション:学術雑誌掲載論文等

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