Thermoluminescence study of persistent luminescence materials: Eu2+- and R3+-doped calcium aluminates, CaAl2O4:Eu2+,R3+

The Journal of Physical Chemistry. B
Tuomas AitasaloJanne Niittykoski

Abstract

Thermoluminescence properties of the Eu2+-, R3+-doped calcium aluminate materials, CaAl2O4:Eu2+,R3+, were studied above room temperature. The trap depths were estimated with the aid of the preheating and initial rise methods. The seemingly simple glow curve of CaAl2O4:Eu2+ peaking at ca. 80 degrees C was found to correspond to several traps. The Nd3+ and Tm3+ ions, which enhance most the intensity of the high-temperature TL peaks, form the most suitable traps for intense and long-lasting persistent luminescence, too. The location of the 4f and 5d ground levels of the R3+ and R2+ ions were deduced in relation to the band structure of CaAl2O4. No clear correlation was found between the trap depths and the R3+ or R2+ level locations. The traps may thus involve more complex mechanisms than the simple charge transfer to (or from) the R3+ ions. A new persistent luminescence mechanism presented is based on the photoionization of the electrons from Eu2+ to the conduction band followed by the electron trapping to an oxygen vacancy, which is aggregated with a calcium vacancy and a R3+ ion. The migration of the electron from one trap to another and also to the aggregated R3+ ion forming R2+ (or R3+-e-) is then occurring. The reverse proce...Continue Reading

Citations

Feb 9, 2008·Journal of Fluorescence·Iko HyppänenTero Soukka
Apr 30, 2015·Luminescence : the Journal of Biological and Chemical Luminescence·Mohammad ZiyauddinD P Bisen
Dec 23, 2015·Dalton Transactions : an International Journal of Inorganic Chemistry·Yanjie LiangZhengwei Pan
Jan 21, 2015·Inorganic Chemistry·Pengjiu WangJianbei Qiu
Jul 18, 2015·Chemistry, an Asian Journal·Hai-Feng LiCheng-Yu Li
Dec 14, 2011·Luminescence : the Journal of Biological and Chemical Luminescence·A N Yerpude, S J Dhoble
Sep 23, 2014·Luminescence : the Journal of Biological and Chemical Luminescence·Ishwar Prasad SahuNameeta Brahme
Jun 6, 2013·Optics Express·Jun-Cheng ZhangYun-Ze Long
Feb 11, 2014·The Journal of Physical Chemistry. a·Danuta DutczakAndries Meijerink
Oct 27, 2011·The Journal of Physical Chemistry. a·Yuntao WuShangke Pan
Jul 16, 2014·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·A Suresh KumarV Gunasekaran
Nov 7, 2017·Physical Chemistry Chemical Physics : PCCP·H G YeS J Xu
Mar 28, 2019·Angewandte Chemie·Zhongliang GongXueyuan Chen
Oct 1, 2013·Journal of Physics. Condensed Matter : an Institute of Physics Journal·J BarzowskaY Zorenko
Jun 12, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Danilo Ormeni Almeida Dos SantosLucas Carvalho Veloso Rodrigues
Nov 21, 2018·Light, Science & Applications·Yan-Min YangHong-Tao Sun
Aug 5, 2017·Materials·David Van der HeggenPhilippe F Smet
Jun 6, 2017·Luminescence : the Journal of Biological and Chemical Luminescence·Ou HaiJieliang Hu
May 27, 2011·Materials·Koen Van den EeckhoutDirk Poelman
Nov 13, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Victor CastaingBruno Viana
Jun 15, 2019·Inorganic Chemistry·Zhizhen WangQuanlin Liu

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