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Europium‐Activated KSrPO 4 –( Ba , Sr ) 2 SiO 4 Solid Solutions as Color‐Tunable Phosphors for Near‐ UV Light‐Emitting Diode Applications
Author(s) -
Han J. K.,
Hannah M. E.,
Piquette A.,
Talbot J. B.,
Mishra K. C.,
McKittrick J.
Publication year - 2013
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.12212
Subject(s) - chemistry , analytical chemistry (journal) , chromatography
This article reports the structural and luminescence characteristics of Eu 2+ ‐activated solid solutions of ( KSrPO 4 ) 1− x ·(( Ba , Sr ) 2 SiO 4 ) x for 0 ≤ x ≤ 1. These phosphors were prepared by a sol‐gel/Pechini method. The lattice parameters of the solid solutions are linearly dependent on x . The reliability factor from Rietveld analysis is nearly constant and independent of x , indicating KSrPO 4 ·( Ba , Sr ) 2 SiO 4 forms an ideal solid solution. The emission spectra consist of two distinct broad bands, which depend on x : blue ranging from 430 to 470 nm and green–yellow ranging from 515 to 570 nm. Both emission peaks red‐shift as x increases due to the crystal field effect and an anomalous transition. The emission intensity of these solid solutions is also a function of x and is comparable to that of LiCaPO 4 : Eu 2+ ( QE = 81%) at x = 0.1, suggesting that these color‐tunable solid solutions are promising for applications in solid‐state white lighting.