Investigation of Pr3 as a sensitizer in quantum-cutting fluoride phosphors
Applied Physics Letters, ISSN: 0003-6951, Vol: 92, Issue: 8
2008
- 36Citations
- 16Captures
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Article Description
A quantum-cutting (QC) phosphor K2 Gd F5: Eu3+ shows poor optical absorption and a theoretical quantum efficiency (QE) of 107% in the ultraviolet (UV) and vacuum ultraviolet (VUV) excitation spectral ranges. Pr3+ was codoped as a sensitizer in K2 Gd F5: Eu3+, thus increasing the absorption in the UV and VUV spectral regions; the theoretical QE of K2 Gd F5: Eu3+, Pr3+ was increased to 138%. The spectra indicate that the possible mechanisms of QC and energy transfer differ from those of phosphors containing the Gd3+ - Eu3+ couple. Temporally resolved measurements of fluorescence decay confirm the proposed QC mechanism for the phosphor containing the Gd3+ - Eu3+, Pr3+ system. © 2008 American Institute of Physics.
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