Photoluminescence and energy transfer in Tb{sup 3+}/Mn{sup 2+} co-doped ZnAl{sub 2}O{sub 4} glass ceramics

Journal Article · Mon Aug 15 00:00:00 EDT 2011 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2011.05.059· OSTI ID:21580220

Lakshminarayana, Gandham ^[1]; Wondraczek, Lothar ^[1]

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1. Department of Materials Science, University of Erlangen-Nuremberg, Erlangen 91058 (Germany)

We report on Tb{sup 3+} as efficient sensitizer for red photoemission from Mn{sup 2+}-centers in ZnO-B{sub 2}O{sub 3}-Al{sub 2}O{sub 3}-Si{sub 2}O-Na{sub 2}O-SrO glasses and corresponding gahnite glass ceramics. In comparison to singly or co-doped glasses, the glass ceramics exhibit significantly increased emission intensity. Structural considerations, ESR, and dynamic luminescence spectroscopy indicate partial incorporation of Mn{sup 2+} as well as Tb{sup 3+} into the crystalline phase, the former on octahedral Zn{sup 2+}-sites. Interionic distance and charge transfer probability between both species depend on crystallization conditions. This enables control of the energy transfer process and, hence, tunability of the color of photoemission by simultaneous emission from Tb{sup 3+} and Mn{sup 2+} centers. Concentration quenching in Mn{sup 2+}-singly doped materials was found at a critical dopant concentration of about 1.0 mol%. The energy transfer process was studied in detail by dynamic as well as static luminescence spectroscopy. Spectroscopic results suggest the application of the studied materials as single or dual-mode emitting phosphor for luminescent lighting. - Graphical abstract: In the prepared Tb{sup 3+}/Mn{sup 2+} codoped glass ceramics containing gahnite (ZnAl{sub 2}O{sub 4}) nanocrystals, the luminescence color is changed from green light to yellowish-red light with an increase in Mn{sup 2+} concentration due to enhanced energy transfer from Tb{sup 3+} to Mn{sup 2+} ions. This tunability should have potential applications in solid state lighting to produce white light, which can be obtained by appropriately optimizing the ratio of Tb{sup 3+}/Mn{sup 2+} ions under UV(350 nm) excitation. Highlights: > Photoluminescence from Mn{sup 2+} and Tb{sup 3+} singly and co-doped glasses and gahnite glass ceramics was studied. > Occurrence of energy transfer from Tb{sup 3+} to Mn{sup 2+} was confirmed. > Luminescence color tunability is achieved by varying dopant concentration and crystallization parameters.

• OSTI ID: 21580220
• Journal Information: Journal of Solid State Chemistry, Vol. 184, Issue 8; Other Information: DOI: 10.1016/j.jssc.2011.05.059; PII: S0022-4596(11)00308-2; Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ALUMINIUM OXIDES
BORON OXIDES
CERAMICS
CRYSTALLIZATION
DOPED MATERIALS
ELECTRON SPIN RESONANCE
ENERGY TRANSFER
GLASS
MANGANESE IONS
NANOSTRUCTURES
PHOTOEMISSION
PHOTOLUMINESCENCE
RARE EARTHS
SENSITIZERS
SOLIDS
TERBIUM IONS
TRANSITION ELEMENTS
ZINC IONS
ALUMINIUM COMPOUNDS
BORON COMPOUNDS
CHALCOGENIDES
CHARGED PARTICLES
ELEMENTS
EMISSION
IONS
LUMINESCENCE
MAGNETIC RESONANCE
MATERIALS
METALS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHOTON EMISSION
REAGENTS
RESONANCE
SECONDARY EMISSION