A Single-Phased Emission-Tunable Phosphor Ca9Y(PO4)7:Eu2+,Mn2+ with Efficient Energy Transfer for White-Light-Emitting Diodes

被引:313
作者
Huang, Chien-Hao [1 ,2 ]
Chen, Teng-Ming [1 ,2 ]
Liu, Wei-Ren [3 ]
Chiu, Yi-Chen [3 ]
Yeh, Yao-Tsung [3 ]
Jang, Shyue-Ming [3 ]
机构
[1] Natl Chiao Tung Univ, Phosphors Res Lab, Hsinchu 30010, Taiwan
[2] Natl Chiao Tung Univ, Dept Appl Chem, Hsinchu 30010, Taiwan
[3] Ind Technol Res Inst, Mat & Chem Res Labs, Hsinchu 30011, Taiwan
关键词
Ca9Y(PO4)(7); Eu2+; Mn2+; photoluminescence; energy transfer; white-light LED; LUMINESCENT PROPERTIES; LEDS; MN;
D O I
10.1021/am900668r
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
A series of single-composition emission-tunable Ca9Y(PO4)(7):Eu2+,Mn2+ phosphors were synthesized by solid-state reaction. The energy transfer from Eu2+ to Mn2+ in Ca9Y(PO4)(7) host matrix was studied and demonstrated to be a resonant type via a dipole-quadrupole mechanism with the critical distance of similar to 11 angstrom. The wavelength-tunable white light can be realized by coupling the emission bands centered at 486 and 638 nm ascribed to the contribution From Eu2+ and Mn2+, respectively. By properly tuning the relative composition of Eu2+/Mn2+, chromaticity coordinates of (0.31, 0.33) can be achieved under excitation at 250-440 nm. Moreover, white-light-emitting diodes were fabricated through the integration of 365 nm chips and single composition white-light-emitting phosphors (Ca0.975Eu0.01Mn0.015)(9)Y(PO4)(7) into a single package shows a cool white light of 7200 K, color rendering index of 76, and color coordinates of (0.30, 0.31) close to that of ideal white light can be achieved.
引用
收藏
页码:259 / 264
页数:6
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