A quantum-splitting phosphor exploiting the energy transfer from anion excitons to Tb3+ in CaSO4 : Tb,Na
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- Title
- A quantum-splitting phosphor exploiting the energy transfer from anion excitons to Tb3+ in CaSO4 : Tb,Na
- Authors
- Lakshmanan, AR; Kim, SB; Jang, HM; Kum, BG; Kang, BK; Heo, S; Seo, D
- Date Issued
- 2007-01-22
- Publisher
- WILEY-V C H VERLAG GMBH
- Abstract
- Wide-bandgap materials doped with rare-earth ions are currently of great interest as new vacuum ultraviolet (VUV) phosphors for lighting and displays. Ibis paper reports the development of a highly sensitive green phosphor, CaSO4:Tb,Na, which exhibits a quantum efficiency higher than 100% by exploiting the energy-transfer mechanism from anion excitons to the activator ions, Tb3+. The VUV excitation spectra of CaSO4:Tb3+ with Na+ as a charge compensator show two prominent excitation bands at 147 and 216 nm. The former band is attributed to the charge-transfer excitations within SO42- complexes while the latter was assigned to the 48 -> 4f(7)5d transitions on Tb3+. The energy-transfer mechanism from anion excitons to Tb3+ strongly raises the possibility of two-photon emission via a second-order down-conversion under the VUV excitation, which is basically a new approach in the goal of achieving a quantum-splitting phosphor.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/23566
- DOI
- 10.1002/ADFM.2006000
- ISSN
- 1616-301X
- Article Type
- Article
- Citation
- ADVANCED FUNCTIONAL MATERIALS, vol. 17, no. 2, page. 212 - 218, 2007-01-22
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