Novel powellite-based red-emitting phosphors: CaLa{sub 1-x}NbMoO{sub 8}:xEu{sup 3+} for white light emitting diodes
- Materials and Minerals Division, National Institute for Interdisciplinary Science and Technology (NIIST), Trivandrum 695 019 (India)
We report the photoluminescence properties of a novel powellite-based red-emitting phosphor material: CaLa{sub 1-x}NbMoO{sub 8}:xEu{sup 3+} (0.01, 0.03, 0.05, 0.1) for the first time. The photoluminescence investigations indicated that CaLa{sub 1-x}NbMoO{sub 8}:xEu{sup 3+} emits strong red light at 615 nm originating from {sup 5}D{sub 0}{yields}{sup 7}F{sub 2} (electric dipole transition) under excitation either into the {sup 5}L{sub 0} state with 394 nm or the {sup 5}D{sub 2} state with 464 nm, that correspond to the two popular emission lines from near-UV and blue LED chips, respectively. When compared with emission intensity from a CaMoO{sub 4}:Eu{sup 3+}, the emission from CaLaNbMoO{sub 8}:Eu{sup 3+} showed greater intensity values under the same excitation wavelength (394 nm). The enhanced red emission is attributed to the enhanced f-f absorption of Eu{sup 3+}. These materials could be promising red phosphors for use in generating white light in phosphor-converted white light emitting diodes (WLEDs). - Graphical Abstract: Novel powellite-based red-emitting phosphors: CaLa{sub 1-x}NbMoO{sub 8}:xEu{sup 3+} (x=0.01, 0.03, 0.05, 0.1) have been prepared and characterized for the first time. The photoluminescence investigations indicated that CaLa{sub 1-x}NbMoO{sub 8}:xEu{sup 3+} emits strong red light at 615 nm originating from {sup 5}D{sub 0}{yields}{sup 7}F{sub 2} (electric dipole transition) under excitation either into the {sup 5}L{sub 0} state with 394 nm or the {sup 5}D{sub 2} state with 464 nm. The red emission of CaLa{sub 0.95}NbMoO{sub 8}:0.05Eu{sup 3+} is 10 times stronger than that of CaMoO{sub 4}:0.05Eu{sup 3+} under the same excitation wavelength (394 nm)
- OSTI ID:
- 21212178
- Journal Information:
- Journal of Solid State Chemistry, Vol. 182, Issue 1; Other Information: DOI: 10.1016/j.jssc.2008.10.015; PII: S0022-4596(08)00532-X; Copyright (c) 2008 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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