Premium
Luminescence behavior of Li 2 Sr 1‐3 x /2 Eu x SiO 4 red phosphors for LED applications
Author(s) -
Sun XinYuan,
Lin LiangWu,
Liu GuangYao,
Liu XinGen,
Wu AiJin,
Huang ShiMing
Publication year - 2014
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.2516
Subject(s) - phosphor , photoluminescence , ion , excited state , luminescence , analytical chemistry (journal) , light emitting diode , photoluminescence excitation , ultraviolet , excitation , materials science , ultraviolet light , chemistry , optoelectronics , atomic physics , physics , organic chemistry , chromatography , quantum mechanics
Red‐emitting Li 2 Sr 1‐3 x /2 Eu x SiO 4 0≤ x ≤0.5) phosphors were synthesized at 900°C in air by a solid‐state reaction. The synthesized phosphors were characterized by X‐ray powder diffraction, photoluminescence (PL) excitation (PLE) and PL spectra. The results from the PLE spectra suggest that the strong 394 nm excitation peak associated with the 5 L 6 state of Eu 3+ ions is of significance for near ultraviolet pumped white light‐emitting diodes and solid‐state lighting. It is also noted that the position of the charge transfer state of Eu 3+ ions shifts towards the higher energy side (blue shift) by increasing the content of Eu 3+ ions. The predominant emissions of Eu 3+ ions under 394 nm excitation are observed at 580, 593, 614, 656 and 708 nm, which are attributed to the 5 D 0 → 7 F J (J = 0, 1, 2, 3 and 4), respectively. The PL results reveal that the optimal content of the red‐emitting Li 2 Sr 1‐3 x /2 Eu x SiO 4 phosphors is x = 0.475. Simulation of the white light excited by 394 nm near ultraviolet light has also been carried out for its potential white light‐emitting diode applications. Copyright © 2013 John Wiley & Sons, Ltd.