resumo
Dy3+ and Tm3+ co-doped YAl3(BO3)(4) (YAB) phosphors were prepared by solid-state reaction method at 1200 degrees C/3 h. The average crystallite size was determined as 52.09 nm from the X-ray diffraction measurements. Upon 352 and 359 nm near ultra violet excitation, the YAB:Dy3+-Tm3+ phosphors exhibit Dy3+:F-4(9/2) --> H-6(J) = (J = 15/2, 13/2, 11/2) and Tm3+:D-1(2) --> F-3(4) transitions with different luminescence intensity. The photoluminescence emission and decay measurements revealed the energy transfer from Dy3+ to Tm3+ ions under 359 nm excitation only. The energy transfer between Dy3+ and Tm3+ takes place in Dy3+-Tm3+ clusters through exchange interaction mechanism. The Commission International de I'Eclairage chromaticity coordinates of YAB:Tm3+ phosphor (lambda(ex) = 359 nm) were found very close to the European Broadcasting Union and National Television Standard Committee illuminants. The emission color of the studied phosphors could be tuned from blue-to-white as a function of excitation wavelength. The YAB:Dy3+-Tm3+ phosphors can be used as potential candidates in display technology. (C) 2013 Elsevier B.V. All rights reserved.
palavras-chave
WHITE-LIGHT-EMISSION; ENERGY-TRANSFER; LUMINESCENCE PROPERTIES; EMITTING PHOSPHOR; BLUE PHOSPHORS; TM3+; PHOTOLUMINESCENCE; DY3+; GREEN; IONS
categoria
Materials Science; Optics
autores
Reddy, GVL; Moorthy, LR; Packiyaraj, P; Jamalaiah, BC
nossos autores
Bungala Chinna Jamalaiah
Bolseiro de pós-DoutoramentoGrupos
agradecimentos
One of the authors Dr. B.C. Jamalaiah would like to thank the Fundacao para a Ciencia e a Tecnologia (FCT), Ministerio da Educacao e Ciencia, Portugal for supporting him as a Post-Doctoral Researcher wide Ref. No. SFRH/BPD/76581/2011. Also, it is part of High-Impact Research scheme of IIT Delhi.