White Light Emission from NaCaPO4:Dy3+ Phosphor for Ultraviolet-Based White Light-Emitting Diodes

被引:168
作者
Ratnam, B. V. [1 ]
Jayasimhadri, M. [1 ]
Jang, Kiwan [1 ]
Lee, Ho Sueb [1 ]
Yi, Soung-Soo [2 ]
Jeong, Jung-Hyun [3 ]
机构
[1] Changwon Natl Univ, Dept Phys, Chang Won 641773, South Korea
[2] Silla Univ, Dept Photon, Pusan 617736, South Korea
[3] Pukyong Natl Univ, Dept Phys, Pusan 608737, South Korea
关键词
LUMINESCENCE PROPERTIES; GLASSES;
D O I
10.1111/j.1551-2916.2010.03963.x
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Trivalent dysprosium (Dy3+)-doped NaCaPO4 phosphors were synthesized by using a conventional solid-state reaction technique. The phase and the structure of the as-prepared powders were characterized by using X-ray diffraction analysis and revealed that the pure NaCaPO4 formed with orthorhombic structure. The photoluminescence excitation and emission spectra were measured to characterize the luminescent properties of NaCaPO4:Dy3+ phosphors. Sharp emission peaks were observed at 482 nm (blue) and 575 nm (yellow) upon 367 nm excitation, which are attributed to the characteristic F-4(9/2) -> H-6(J) (J = 15/2 and 13/2) transitions of trivalent Dy3+ ions, respectively. The suitable control of the blue/yellow intensity ratio is expected to realize a white luminescent system. The lifetime of F-4(9/2) level was measured by exciting Dy3+ ions at 355 nm excitation. The chromaticity coordinates were calculated from the emission spectra and analyzed with Commission International de I'Eclairage (CIE) programs and diagrams. The CIE color coordinates fall in the white light region under different ultraviolet (UV) excitations. These results indicate that NaCaPO4:Dy3+ phosphor could be a potential candidate for UV-based white light-emitting diodes.
引用
收藏
页码:3857 / 3861
页数:5
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