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Site‐Selective Upconversion Luminescence of Ho 3+ ‐Doped CaF 2 Crystals
Author(s) -
Zhang Xiao,
Jouart J.P.,
Bouffard M.,
Mary G.
Publication year - 1994
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.2221840230
Subject(s) - photon upconversion , excited state , dimer , excitation , absorption (acoustics) , doping , materials science , ground state , luminescence , photochemistry , atomic physics , analytical chemistry (journal) , optoelectronics , chemistry , nuclear magnetic resonance , physics , quantum mechanics , composite material , chromatography
With red dye laser excitation, site‐selective upconversion properties of three Ho 3+ centres (C 4v , C 3v , and dimer) in CaF 2 , : 0.1 at% Ho 3+ crystals are studied. The energy level diagrams for the three centres are deduced from the spectral data. The excited state absorption from the 5 I 7 level plays a very important role in the upconversion coming from C 4v , and C 3v centres, whereas the ground state absorption of 5 I 8 , dominates for that from the dimer centre. The upconversion of C 4v and C 3v centres is explained by a sequential two‐photon excitation mechanism. For the dimer centre, the predominant upconversion mechanism is energy transfer.