Identification of the photoluminescence response in the frequency domain modulated infrared radiometry signal of ZnTe:Cr bulk crystal |
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| Affiliation: | 1. Technical Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India;2. UGC-DAE Consortium for Scientific Research, Mumbai Centre, BARC, Mumbai 400085, India;3. Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India;4. Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India;1. Departamento de Física, Universidade do Estado de Santa Catarina, 89.219-710 Joinville, SC, Brazil;2. Instituto Federal Catarinense, 89163-356 Rio do Sul, SC, Brazil;1. Amirkhanov Institute of Physics, DSC of RAS, Makhachkala, 367003, Russia;2. Department of Physics, Chungbuk National University, Cheongju, 28644, South Korea;3. Institute of Materials Science, VAST, 18-Hoang Quoc Viet, Hanoi, Viet Nam;1. Materials Physics Division, School of Advanced Sciences, VIT University, Vellore 632014, Tamil Nadu, India;2. Department of Physics, S.V.A. Government College (M), Srikalahasti 517644, A.P., India;3. Department of Physics, N.B.K.R. S&A College, Vidyanagar 524414, A.P., India |
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| Abstract: | In this work we investigated the photoluminescence response in the frequency domain modulated infrared radiometry signal observed of ZnTe:Cr bulk crystal. In mid-infrared range, three characteristic phenomena are observed in ZnTe:Cr crystal: absorption and emission of IR photons (2–3 μm) and the free carrier absorption. This implies that the modulated infrared radiometry signal yields information about the effective infrared absorption coefficient (photothermal response) as well about the recombination lifetime of carriers related with the infrared photoluminescence emission. In this paper, the frequency equivalence of the two-term independent exponential photoluminescence decay model in order to explain the measured frequency characteristics is proposed. The measured recombination lifetimes (2.3 μs for two exponential decay model and 1.5 μs for one exponential decay model) are in good agreement with the values given by other authors (about 2.5–3.0 μs). Moreover, we found that the photothermal response is uncorrelated with the photoluminescence one, in contrast, to the photocarrier response. |
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