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Tailoring the photoluminescent properties of samarium and dysprosium codoped calcium zirconate perovskites for WLED applications
Author(s) -
Venugopal Meenu,
Padma Kumar Hariharan,
Satheesh Ramachandran,
Jayakrishnan Ramakrishnan
Publication year - 2019
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.13174
Subject(s) - photoluminescence , materials science , dysprosium , samarium , perovskite (structure) , orthorhombic crystal system , doping , analytical chemistry (journal) , zirconate , calcination , phosphor , quantum yield , mineralogy , ceramic , crystallography , crystal structure , optoelectronics , fluorescence , inorganic chemistry , optics , metallurgy , chemistry , biochemistry , physics , chromatography , catalysis , titanate
This study investigates the photoluminescent properties of Dy 3+ /Sm 3+ single and codoped CaZrO 3 perovskites that were prepared through conventional solid state ceramic route method. X‐ray diffraction studies confirmed the orthorhombic (Pnma) perovskite structure of the calcined samples. Photoluminescence studies of Dy 3+ doped CaZrO 3 systems showed emission peaks at 484 nm and 575 nm due to the transition between 4 F 9/2 – 6 H 15/2 and 4 F 9/2 – 6 H 13/2 levels respectively. Intense red emissions were observed for Sm 3+ doped CaZrO 3 systems at around 567 nm, 603 and 646 nm that corresponds to the 4 G 5 / 2 → 6 H 5 / 2 , 4 G 5 / 2 → 6 H 7 / 2 and 4 G 5 / 2 → 6 H 9 / 2 transitions of Sm 3+ . Two different emissions were observed at different excitations for Dy 3+ /Sm 3+ codoped CaZrO 3 systems. Pleasant white light emission was achieved for the CaZr 0.9 Sm 0.025 Dy 0.075 O 3 system at 354 nm excitation with CIE color coordinates (0.3310, 0.3349) with a quantum yield of 16.14%, makes this system a promising candidate for WLED and display device applications. Uniform grain morphology and elemental composition of CaZr 0.9 Sm 0.025 Dy 0.075 O 3 sample was revealed from scanning electron microscopic and electron dispersive X‐ray analysis. The presence of elements and their oxidation states in the calcined samples for doubly doped system was confirmed from X‐Ray photoelectron spectroscopicstudies.