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Spectroscopic and photoluminescence characterization of Dy 3+ in Sr 0.5 Ca 0.5 TiO 3 phosphor
Author(s) -
Vidyadharan Viji,
Sreeja E.,
Jose Saritha K.,
Joseph Cyriac,
Unnikrishnan N. V.,
Biju P. R.
Publication year - 2016
Publication title -
luminescence
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 45
eISSN - 1522-7243
pISSN - 1522-7235
DOI - 10.1002/bio.2946
Subject(s) - photoluminescence , phosphor , luminescence , analytical chemistry (journal) , dysprosium , chromaticity , materials science , excited state , doping , orthorhombic crystal system , photoluminescence excitation , perovskite (structure) , chemistry , crystal structure , crystallography , optics , atomic physics , inorganic chemistry , optoelectronics , physics , chromatography
The spectroscopic and photoluminescence characteristics of trivalent dysprosium (Dy 3+ )‐doped Sr 0.5 Ca 0.5 TiO 3 phosphor materials synthesized via solid‐state reaction method were studied. The X‐ray diffraction profile confirmed the orthorhombic perovskite structure of the prepared samples. Judd–Ofelt analysis was carried out to obtain the intensity parameters and predicted radiative properties of Sr 0.5 Ca 0.5 TiO 3 :2wt%Dy 3+ . The photoluminescence spectrum of Dy 3+ ‐doped Sr 0.5 Ca 0.5 TiO 3 showed three emission peaks at 481, 574 and 638 nm corresponding to 4 F 9/2 → 6 H 15/2 , 4 F 9/2 → 6 H 13/2 and 4 F 9/2 → 6 H 11/2 transitions respectively. The variation of luminescence intensity with different excitation wavelengths and Dy 3+ concentrations is discussed. The decay profiles of 4 F 9/2 excited levels of Dy 3+ ions show bi‐exponential behaviour and also a decrease in average lifetime with increase in Dy 3+ concentration. Yellow to blue luminescence intensity ratio, CIE chromaticity co‐ordinates and correlated color temperature were also calculated for different concentrations of Dy 3+ ‐doped Sr 0.5 Ca 0.5 TiO 3 phosphor at different λ ex . Copyright © 2015 John Wiley & Sons, Ltd.