Tunable photoluminescence properties of Ca8NaLa(PO4)6F2:Eu2+,Mn2+ phosphor under UV excitation.
- Resource Type
- Article
- Authors
- Zhang, Fen; Lan, Tong; Tang, Wanjun
- Source
- Materials Research Bulletin. Apr2015, Vol. 64, p128-133. 6p.
- Subject
- *TUNABLE lasers
*PHOTOLUMINESCENCE
*PHOSPHORS
*CHEMICAL synthesis
*MANGANOUS sulfate
*EUROPIUM
*ENERGY transfer
*LIGHT emitting diodes
- Language
- ISSN
- 0025-5408
A series of Eu 2+ and Mn 2+ coactivated Ca 8 NaLa(PO 4 ) 6 F 2 (CNLF) phosphors have been synthesized by a combustion-assisted synthesis method. The investigation revealed that Ca 8 NaLa(PO 4 ) 6 F 2 crystallized in a hexagonal crystal system with the space group P 6 3 / m (176). The Eu 2+ activated phosphors can be efficiently excited in the range of 270–400 nm and give intense blue emission peaking at 451 nm. By codoping the Eu 2+ and Mn 2+ ions into the CNLF host and singly varying the doping content of the Mn 2+ ion, tunable colors from blue to white and eventually to yellow are obtained in CNLF:Eu 2+ ,Mn 2+ phosphors under the irradiation of 330 nm. The energy transfer from Eu 2+ to Mn 2+ in CNLF:Eu 2+ ,Mn 2+ has been demonstrated to be a resonant type via a dipole–dipole mechanism and the critical distance of energy transfer from Eu 2+ to Mn 2+ was estimated to be about 11.9 Å. The investigation indicates that the obtained samples might have potential application in white LEDs. [ABSTRACT FROM AUTHOR]