Journal
OPTICAL MATERIALS
Volume 34, Issue 1, Pages 261-264Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optmat.2011.08.026
Keywords
Phosphor; Luminescence properties; LED devices
Categories
Funding
- National Nature Science Foundation of China [10834006, 10904141, 10904140, 51172226]
- MOST of China [2010AA03A404]
- Scientific Project of Jilin Province [20090134, 20090524]
- CAS
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Green-emitting phosphor Ca8Zn(SiO4)(4)Cl-2:Eu2+ has been prepared by the solid state reaction method and there luminescence properties are investigated. The excitation spectrum of Ca8Zn(SiO4)(4)Cl-2:Eu2+ shows an intense excitation band in the blue centered at 450 nm and emits with a maximum at 505 nm. The concentration quenching mechanism is studied and verified to be the energy transfer among the nearest-neighbor ions. Upon 450 nm excitation, the emission intensity of Ca8Zn(SiO4)(4)Cl-2:Eu2+ is much stronger than the green emitting Ca3SO4Cl2:Eu2+ phosphor and even higher than YAG:Ce3+. This excitation spectrum range matches UV and blue light-emitting diodes (LEDS) chips very well, suggesting Ca8Zn(SiO4)(4)Cl-2:Eu2+ could be a promising green emitting phosphor candidate for LED devices. (C) 2011 Elsevier B.V. All rights reserved.
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