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An efficient orange–red‐emitting LiNa 3 P 2 O 7 :Sm 3 + pyrophosphate: Structural and optical analysis for solid‐state lighting
Author(s) -
Dillip G.R.,
Munirathnam K.,
Raju B. Deva Prasad,
Sushma N. John,
Joo S.W.
Publication year - 2017
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.3249
Subject(s) - phosphor , chromaticity , orthorhombic crystal system , analytical chemistry (journal) , ion , color temperature , doping , chemistry , luminescence , x ray photoelectron spectroscopy , color rendering index , spectroscopy , materials science , crystallography , crystal structure , optics , nuclear magnetic resonance , physics , optoelectronics , organic chemistry , chromatography , quantum mechanics
Abstract A trivalent rare‐earth ion (Sm 3 + )‐doped LiNa 3 P 2 O 7 (LNPO) phosphor was synthesized using a conventional high‐temperature solid‐state reaction route. A predominant orthorhombic phase of LNPO was observed in all X‐ray diffraction patterns. The surface states of the LNPO:Sm phosphor were confirmed by X‐ray photoelectron spectroscopy. Under 401 nm excitation, the Sm‐doped LNPO phosphors showed sharp emission peaks at 563, 600 and 647 nm that are related to the f–f transition of Sm 3 + ions. The optimum concentration of Sm 3 + (9 mol%) produced Commission Internationale de l'Eclairage chromaticity coordinates, color rendering index and correlated color temperature of (0.564, 0.434), 42 and 1843 K, respectively.