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Enhanced red emission of CaMoO 4 :Eu 3+ phosphor by structural adjustment for white light‐emitting diodes application
Author(s) -
Zhang Zhan Hui,
Huang Qiang,
Zhao Xu,
Huang Zhi Liang
Publication year - 2009
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200925086
Subject(s) - phosphor , luminescence , emission intensity , light emitting diode , materials science , analytical chemistry (journal) , diode , crystal structure , chemistry , optoelectronics , crystallography , chromatography
Na + was incorporated into red‐emitting CaMoO 4 :Eu 3+ phosphor to form solid solutions and reduce the crystal symmetry. For a fixed Eu 3+ concentration, the luminescent properties as a function of Na + concentrations were systematically studied under near‐ultraviolet (UV) excitation. Enhanced red emission at 613 nm was observed and the strongest intensity was 4.5 times that of the sample without Na + . Differing from the charge‐compensation mechanism, this enhancement was related to the structural distortion and decreasing centrosymmetry. The increased ratios of red emission ( 5 D 0 → 7 F 2 ) to orange ( 5 D 0 → 7 F 1 ) in intensity revealed that the structural adjustment was achieved in the phosphors via the incorporation of Na + .