Photoluminescence of Sm^<3+>Ions in MgS,CaS,SrS and BaS Phosphors
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概要
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Details of emission and excitation spectra of powder phosphors were obtained atvarious temperatures between 6 K and room temperature. The emission spectra con-sist of six groups of emission lines located at about 565, 605, 650, 710, 790 and 900nm at 300K. The position of each emission line shifts slightly towards shorterwavelengths in the order, MgS:Sm", CaS:Sm", SrS:Sm" and BaS:Sm". The firstfive groups are assigned to the transitions from the'G.7.state to thc'H.(J=5/2, 7/2,9/2, 1172, 13/2)statesandthelastgrouptothe'F,(,7=1/2, 3/2, 5/2)statesinaSm"ion. The excitation processes are explained as being due to three transitions; (i) thetransitions within the 4 f ' configuration in a Sm" Ton, (ii) the electronic 4 f ' -+ 4 f " 5dtransition in a Sm" Ton and (iii) the fundamental absorption in host crystal, followedby the transfer of the excitation energy to an unexcited Sm" ion.
- 1987-01-15
著者
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YAMASHITA Nobuhiko
Department of Physics,Faculty of Science,Okayama University
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Asano Sumitada
Department Of Electronic Engineering Faculty Of Technology Okayama University Of Science
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Yamashita N
Okayama Univ. Okayama Jpn
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Yamashita Nobuhiko
Department Of Physics Faculty Of Education Okayama University
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