Abstract
In order to evaluate the possibility of usingCr3+ co-doping to modify the emission properties ofPr3+-based quantum cutting phosphors, which emit one ultraviolet (UV) and onevisible photon from each vacuum–UV photon absorbed, into phosphors that emittwo visible photons, the optical spectroscopies between 150 and 750 nm ofCaAl12O19:M3+ (M = Pr,Cr) were investigated and compared with those ofSrAl12O19:M3+ using synchrotron radiation as one of the excitation sources. WhenPr3+ is excited to its 4f5d states, cascade emission of UV photons from the1S0 state followed by visible photons from the3P0 state are bothobserved in (Ca,Sr)Al12O19:Pr3+. Similar to SrAl12O19:M3+, there exist desirable spectral overlaps betweenPr3+ 1S0 emissions and theCr3+ higher multipletabsorptions in CaAl12O19, which should be favourable to the energy transfer fromPr3+ 1S0 toCr3+, converting theUV photon from Pr3+ 1S0 intothe red Cr3+ emission. However, the host absorption band and theCr3+-related charge transfer band have an unfavourable overlap with thePr3+ 4f5d states in the vacuum–UV region, preventing efficient selectivePr3+ excitation under radiation of Xe discharge, a prerequisite for the quantum cutting process.
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