Energy transfer rate and electron-phonon coupling properties in Eu3+ -doped nanophosphors.
Luminescence
; 32(3): 425-433, 2017 May.
Article
em En
| MEDLINE
| ID: mdl-27632943
ABSTRACT
A series of controllable emissions SrWO4Eu3+ and charge-compensated SrWO4 Eum3+ (m = 0.01 or 0.20) phosphors was successfully prepared via a simple co-precipitation method. The energy transfer mechanism was studied based on the Huang's theory. A low magnitude of Huang-Rhys factor (10-2 ) was calculated using phonon sideband spectra. The Judd-Ofelt parameters Ωλ (λ = 2, 4 and 6) of Eu3+ -activated SrWO4 doped with charge compensation were obtained. The calculated Commission Internationale de l'Eclairage chromaticity coordinates were found to be about (0.67, 0.33) for SrWO4 Eu0.203+ and charge-compensated SrWO4 Eu0.203+ phosphors, which coincided with the National Television Standard Committee system standard values for red. A white light emission was obtained under 362 nm excitation. The correlated color temperature was computed by a simple equation to characterize light sources. Thus, warm white light-emitting diodes with higher Ra can be constructed by combining as-prepared high efficiency, low correlated color temperature and high color purity phosphor.
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MEDLINE
Assunto principal:
Luminescência
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Elétrons
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Transferência de Energia
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Európio
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Nanopartículas
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Fônons
Idioma:
En
Revista:
Luminescence
Assunto da revista:
BIOFISICA
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BIOQUIMICA
Ano de publicação:
2017
Tipo de documento:
Article