The absorption and steady state emission properties of Pb2+-aggregated phase in NaCl and CsCl matrices are found to be close to those of the PbCl2, and CsPbCl3 bulk crystals, respectively. Much shorter picosecond decay times have been found for CsPbCl3-like aggregates in CsCl host with respect to the bulk CsPbCl3. It is ascribed to microscopic superradiance effect and together with the achieved high energy shift of the exciton absorption peak proves that the quantum confinement effect takes place in the observed emission in CsPbCl3-like aggregates. The autolocalisation of the cation exciton in PbCl2-like aggregates is considered to explain the absence of similar effects in Pb2+-doped NaCl crystals.
Optical properties of Pb2+-based aggregated phase in NaCl and CsCl alkali halide hosts / M. Nikl; K. Polak; K. Nitsch; G.P. Pazzi; P. Fabeni; M. Gurioli. - In: RADIATION EFFECTS AND DEFECTS IN SOLIDS. - ISSN 1042-0150. - STAMPA. - 135:(1994), pp. 787-791.
Optical properties of Pb2+-based aggregated phase in NaCl and CsCl alkali halide hosts
GURIOLI, MASSIMO
1994
Abstract
The absorption and steady state emission properties of Pb2+-aggregated phase in NaCl and CsCl matrices are found to be close to those of the PbCl2, and CsPbCl3 bulk crystals, respectively. Much shorter picosecond decay times have been found for CsPbCl3-like aggregates in CsCl host with respect to the bulk CsPbCl3. It is ascribed to microscopic superradiance effect and together with the achieved high energy shift of the exciton absorption peak proves that the quantum confinement effect takes place in the observed emission in CsPbCl3-like aggregates. The autolocalisation of the cation exciton in PbCl2-like aggregates is considered to explain the absence of similar effects in Pb2+-doped NaCl crystals.
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