Zhaogang Nie et al 2007 J. Phys.: Condens. Matter 19 076204 doi:10.1088/0953-8984/19/7/076204
Spectroscopic investigation of CaAl12O19:M3+ upon UV/vacuum–UV excitation: a comparison with SrAl12O19:M3+ (M = Pr,Cr)
Zhaogang Nie1,2, Jiahua Zhang1,2,5, Xia Zhang1,2, Xinguang Ren1,2, Weihua Di1,2, Guobin Zhang3, Danhong Zhang3 and X-J Wang1,2,4,5
Show affiliationsIn order to evaluate the possibility of using Cr3+ co-doping to modify the emission properties of Pr3+-based quantum cutting phosphors, which emit one ultraviolet (UV) and one visible photon from each vacuum–UV photon absorbed, into phosphors that emit two visible photons, the optical spectroscopies between 150 and 750 nm of CaAl12O19:M3+ (M = Pr,Cr) were investigated and compared with those of SrAl12O19:M3+ using synchrotron radiation as one of the excitation sources. When Pr3+ is excited to its 4f5d states, cascade emission of UV photons from the 1S0 state followed by visible photons from the 3P0 state are both observed in (Ca,Sr)Al12O19:Pr3+. Similar to SrAl12O19:M3+, there exist desirable spectral overlaps between Pr3+ 1S0 emissions and the Cr3+ higher multiplet absorptions in CaAl12O19, which should be favourable to the energy transfer from Pr3+ 1S0 to Cr3+, converting the UV photon from Pr3+ 1S0 into the red Cr3+ emission. However, the host absorption band and the Cr3+-related charge transfer band have an unfavourable overlap with the Pr3+ 4f5d states in the vacuum–UV region, preventing efficient selective Pr3+ excitation under radiation of Xe discharge, a prerequisite for the quantum cutting process.
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Issue 7 (21 February 2007)
Received 15 November 2006, in final form 5 December 2006
Published 2 February 2007
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Spectroscopic investigation of CaAl12O19:M3+ upon UV/vacuum–UV excitation: a comparison with SrAl12O19:M3+ (M = Pr,Cr)
Zhaogang Nie et al 2007 J. Phys.: Condens. Matter 19 076204
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