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Photoluminescence of doped ZnS nanoparticles under hydrostatic pressure
Author(s) -
Li G. H.,
Su F. H.,
Ma B. S.,
Ding K.,
Xu S. J.,
Chen W.
Publication year - 2004
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200405215
Subject(s) - hydrostatic pressure , photoluminescence , analytical chemistry (journal) , pressure coefficient , ion , doping , materials science , emission spectrum , chemistry , thermodynamics , spectral line , physics , optoelectronics , organic chemistry , chromatography , astronomy
The pressure dependence of the photoluminescence from ZnS:Mn 2+ , ZnS:Cu 2+ , and ZnS:Eu 2+ nanoparticles were investigated under hydrostatic pressure up to 6 GPa at room temperature. Both the orange emission from the 4 T 1 – 6 A 1 transition of Mn 2+ ions and the blue emission from the DA pair transition in the ZnS host were observed in the Mn‐doped samples. The measured pressure coefficients are –34.3(8) meV/GPa for the Mn‐related emission and –3(3) meV/GPa for the DA band, respectively. The emission corresponding to the 4f 6 5d 1 – 4f 7 transition of Eu 2+ ions and the emission related to the transition from the conduction band of ZnS to the t 2 level of Cu 2+ ions were observed in the Eu‐ and Cu‐doped samples, respectively. The pressure coefficient of the Eu‐related emission was found to be 24.1(5) meV/GPa, while that of the Cu‐related emission is 63.2(9) meV/GPa. The size dependence of the pressure coefficients for the Mn‐related emission was also investigated. The Mn emission shifts to lower energies with increasing pressure and the shift rate (the absolute value of the pressure coefficient) is larger in the ZnS:Mn 2+ nanoparticles than in bulk. Moreover, the absolute pressure coefficient increases with the decrease of the particle size. The pressure coefficients calculated based on the crystal field theory are in agreement with the experimental results. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)