A potential Eu{sup 3+}-activated Ca{sub 10}K(PO{sub 4}){sub 7} red phosphor for white light-emitting diodes
- Department of Materials Science, School of Physical Science and Technology, Lanzhou University, Lanzhou 730000 (China)
Highlights: Black-Right-Pointing-Pointer The Ca{sub 10}K(PO{sub 4}){sub 7}:Eu{sup 3+}, K{sup +} can be efficiently excited by near-UV light. Black-Right-Pointing-Pointer The Ca{sub 10}K(PO{sub 4}){sub 7}:Eu{sup 3+}, K{sup +} shows a high brightness upon 393 nm excitation. Black-Right-Pointing-Pointer The addition of Mo{sup 6+} can enhance the emission intensity of Eu{sup 3+}. Black-Right-Pointing-Pointer The Ca{sub 10}K(PO{sub 4}){sub 7}:Eu{sup 3+}, K{sup +} could be a potential candidate for white LEDs. -- Abstract: New red Ca{sub 10}K(PO{sub 4}){sub 7}:Eu{sup 3+}, K{sup +} phosphors were synthesized by solid state reaction and their photoluminescence properties as well as those by co-doping Mo{sup 6+} under near ultraviolet excitation were investigated. From the excitation spectra monitored at 611 nm, it can be seen that the strongest excitation peak is situated at 393 nm, well matching with the emission wavelength of near-ultraviolet chips for white LEDs. Upon 393 nm excitation, the brightness of Ca{sub 9}K(PO{sub 4}){sub 7}:0.5Eu{sup 3+}, 0.5 K{sup +} with the optimal Eu{sup 3+}-doping concentration is about 2.3 times stronger than that of the commercial red Y{sub 2}O{sub 3}:Eu{sup 3+} phosphor. The introducing of Mo{sup 6+}, which results in a possible variety for the excited energy level of the host, can enhance the brightness of Eu{sup 3+} to be maximized by about 15%. The CIE chromaticity coordinates of Ca{sub 9}K(PO{sub 4}){sub 7}:0.5Eu{sup 3+}, 0.5 K{sup +} are calculated to (0.654, 0.345), which are close to the (0.67, 0.33) standard of the National Television System Committee. All the above results indicate Eu{sup 3+}-activated Ca{sub 10}K(PO{sub 4}){sub 7} is a potential candidate for white LEDs.
- OSTI ID:
- 22212377
- Journal Information:
- Materials Research Bulletin, Vol. 46, Issue 12; Other Information: Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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