Tunable emission from blue to white light in single-phase Na(0.34)Ca(0.66-x-y)Al(1.66)Si(2.34)O8:xEu2+,yMn2+ (x = 0.07) phosphor for white-light UV LEDs.
Opt Express
; 21(3): 3287-97, 2013 Feb 11.
Article
em En
| MEDLINE
| ID: mdl-23481788
ABSTRACT
A series of single-phased emission-tunable Na(0.34)Ca(0.66)Al(1.66)Si(2.34)O(8)Eu(2+),Mn(2+) phosphors were successfully synthesized by a wet-chemical synthesis method. Photoluminescence excitation (PLE) spectra indicate that the phosphor can be efficiently excited by UV radiation from 250 to 420 nm. Also, NCASOEu(2+),Mn(2+) phosphor exhibit a broad blue emission band at 440 nm and an orange emission band at 570 nm, which originate from Eu(2+) and Mn(2+) ions, respectively. Therefore, overall emission color can be tuned from blue to white by increasing the concentration of Mn(2+) ions in the host lattice utilizing energy transfer from Eu(2+) to Mn(2+) ions. This energy transfer phenomenon was demonstrated to be a resonant type through dipole-dipole interaction determined with the help of PL spectra, decay time measurement, and energy transfer efficiency of the phosphor. These results indicate that NCASOEu(2+),Mn(2+) can be a promising single-phased white-emitting phosphor for white-light UV LEDs.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Refratometria
/
Semicondutores
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Iluminação
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Cor
Idioma:
En
Revista:
Opt Express
Assunto da revista:
OFTALMOLOGIA
Ano de publicação:
2013
Tipo de documento:
Article
País de afiliação:
Coréia do Sul