TY - JOUR
T1 - Efficient red phosphors Na5Ln(MoO4)4:EEu3+ (Ln = La, Gd and Y) for white LEDs
AU - Guo, Chongfeng
AU - Gao, Fei
AU - Xu, Yan
AU - Liang, Lifang
AU - Shi, Frank G.
AU - Yan, Bohan
PY - 2009/5/7
Y1 - 2009/5/7
N2 - A class of red-emitting phosphors Na5Ln(MoO4) 4 : Eu3+(Ln = La, Gd and Y) have been synthesized by the sol-gel technique and their luminescent properties have also been investigated under the near-ultraviolet (n-UV) light. The excitation spectra of these phosphors show the strongest absorption at about 395 nm which matches well with the commercially available n-UV-emitting GaN-based LED chip. Their emission spectra show intense red emission at 618 nm due to the 5D 0-7F2 transition of Eu3+. The phosphor Na5Y1-xEux(MoO4) 4 shows the brightest red light among phosphors Na5Ln 1-xEux(MoO4)4 as the content of Eu3+ is fixed. In addition, the conditions for synthesis of these phosphors are also optimized, including annealing temperature and concentration of Eu3+ ions. While the Li+ or K+ ions are incorporated into Na5Eu(MoO4)4 to substitute for Na+ partially, effects on the luminescent properties and structures of phosphors have also been discussed in detail.
AB - A class of red-emitting phosphors Na5Ln(MoO4) 4 : Eu3+(Ln = La, Gd and Y) have been synthesized by the sol-gel technique and their luminescent properties have also been investigated under the near-ultraviolet (n-UV) light. The excitation spectra of these phosphors show the strongest absorption at about 395 nm which matches well with the commercially available n-UV-emitting GaN-based LED chip. Their emission spectra show intense red emission at 618 nm due to the 5D 0-7F2 transition of Eu3+. The phosphor Na5Y1-xEux(MoO4) 4 shows the brightest red light among phosphors Na5Ln 1-xEux(MoO4)4 as the content of Eu3+ is fixed. In addition, the conditions for synthesis of these phosphors are also optimized, including annealing temperature and concentration of Eu3+ ions. While the Li+ or K+ ions are incorporated into Na5Eu(MoO4)4 to substitute for Na+ partially, effects on the luminescent properties and structures of phosphors have also been discussed in detail.
UR - http://www.scopus.com/inward/record.url?scp=65449128164&partnerID=8YFLogxK
U2 - 10.1088/0022-3727/42/9/095407
DO - 10.1088/0022-3727/42/9/095407
M3 - Article
AN - SCOPUS:65449128164
SN - 0022-3727
VL - 42
SP - 1
EP - 7
JO - Journal of Physics D: Applied Physics
JF - Journal of Physics D: Applied Physics
IS - 9
M1 - 095407
ER -