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• W2952208092 endingPage "5977" @default.
• W2952208092 startingPage "5968" @default.
• W2952208092 abstract "Single crystals of CsCdCl3, CsCdBr3, CsMgBr3, and MgBr2 doped with 0.1/5% Ni2+ were grown by the Bridgman technique and studied by variable-temperature optical absorption and luminescence spectroscopies. At cryogenic temperatures all these systems are dual emitters; i.e., they emit light from two distinct, thermally nonequilibrated excited states. The emitting higher excited state is 1T2g in Ni2+:CsCdCl3 and Ni2+:CsCdBr3 and 1A1g in Ni2+:CsMgBr3 and Ni2+:MgBr2. This crossover manifests itself in a change from red broad-band to yellow sharp-line luminescence, and it is rationalized on the basis of crystal field theory. Temperature-dependent luminescence as well as two-color pump and probe experiments reveal that in Ni2+:CsMgBr3 and Ni2+:MgBr2 the 1T2g state lies only about 70 and 170 cm-1, respectively, above 1A1g. The effect of crystal field strength on thermally activated nonradiative multiphonon relaxation processes in the bromides is examined for both 1A1g/1T2g higher excited state and 3T2g first excited-state emission. Two-color excited-state excitation experiments are used to monitor Ni2+ excited-state absorption transitions originating from 3T2g." @default.
• W2952208092 created "2019-06-27" @default.
• W2952208092 creator A5000683714 @default.
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• W2952208092 date "2002-10-19" @default.
• W2952208092 modified "2023-10-16" @default.
• W2952208092 title "Crystal Field Effects on the Optical Absorption and Luminescence Properties of Ni²⁺-Doped Chlorides and Bromides: Crossover in the Emitting Higher Excited State" @default.
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• W2952208092 doi "https://doi.org/10.1021/ic020347y" @default.
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