Open AccessInvestigation of concentration quenching effect in Tm3+-doped NaY(WO4)2 crystal
Author(s) -
Han Yu Lin,
Feng Song,
Chao Zou,
Jing Su,
Lihua Yan,
Jie Tian,
Guangyin Zhang
Publication year - 2007
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.56.4187
Subject(s) - photon upconversion , materials science , ion , doping , excitation , thulium , fluorescence , laser , absorption (acoustics) , absorption spectroscopy , crystal (programming language) , optoelectronics , analytical chemistry (journal) , optics , chemistry , physics , organic chemistry , quantum mechanics , chromatography , computer science , composite material , programming language
Upconversion blue emissions of Tm3+ ions with different doping (0.5at.%, 3 at.%, 5 at.%) in NaY(WO4)2 crystals are investigated under 800nm diode laser excitation. The upconversion mechanism and the dependence of upconversion efficiency on ion concentration are analyzed with respect to the absorption spectra, fluorescence spectra, and parameters calculated by Judd-Ofelt theory. Four ion-ion interaction processes: 3H5+1G4→3H6+1D2, 3H5+3H5→3H6+3F3, 1G4+3H6→3F4+3F3,1G4+3H6→3F3+3F4, which influence the upconversion dominantly in Tm3+ heavy-doped system, are demonstrated theoretically and experimentally. The results indicate that cross-relaxation and cooperative upconversion are the dominant processes affecting the blue emission efficiency.