標題: A Single-Phased Emission-Tunable Phosphor Ca9Y(PO4)(7):Eu2+,Mn2+ with Efficient Energy Transfer for White-Light-Emitting Diodes
作者: Huang, Chien-Hao
Chen, Teng-Ming
Liu, Wei-Ren
Chiu, Yi-Chen
Yeh, Yao-Tsung
Jang, Shyue-Ming
應用化學系
Department of Applied Chemistry
關鍵字: Ca9Y(PO4)(7);Eu2+;Mn2+;photoluminescence;energy transfer;white-light LED
公開日期: 1-Jan-2010
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.
URI: http://dx.doi.org/10.1021/am900668r
http://hdl.handle.net/11536/149883
ISSN: 1944-8244
DOI: 10.1021/am900668r
期刊: ACS APPLIED MATERIALS & INTERFACES
Volume: 2
起始頁: 259
結束頁: 264
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