Optical Studies of CaS:Eu, Sm Infrared Stimulable Phosphors
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概要
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The photoluminescence (PL) and infrared stimulated luminescence (ISL) spectra of CaS:Eu,Sm infrared stimulable phosphors (ISPs) are studied. In addition, the concentration dependence of DSL intensity is examined. Sm^<3+>- and Eu^<2+>- related structures are found in both the PL excitation and emission spectra. Two types of Sm^<3+> are found, one of which exhibits strong emission at around 650 nm and the other, weak emission compared to the other emissions at around 565 nm and 605 nm. These are assigned to an asymmetric and a symmetric site, respectively. ISL excitation spectra coincide with the Eu^<2+> 4f^7 to 4f^65d^1 and 4f^66s^1 transitions and range from 220 to 650 nm. ISL emission spectra coincide with the Eu^<2+>4f^65d^1 to 4f^7 transition and range from 550 to 750 nm. ISL stimulation spectra range from 0.8 μm to 1.7 μm and are thought to indicate the Sm^<2+> ion transition from 4f^6 to 4f^55d^1. The maximum ISL intensity is obtained from a sample with Eu and Sm concentrations of 500 and 130 ppm, respectively.
- 社団法人応用物理学会の論文
- 1993-07-15
著者
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Tamura Yasuaki
Ntt Opto-electronics Laboratories
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Shibukawa Atsushi
Ntt Opto-electronics Laboratories
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