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PLE spectra of monitored at and . The spectra were scaled to the excitation intensity .
Comparison of PL spectra for with (no QC effect), , and (showing QC effect). The spectra were scaled to the at excitation intensity .
Schematic energy levels of showing possible mechanisms for visible QC with excitation in the VUV with 274 and (b) (① and ② denote the cross relaxation and direct energy transfer, respectively).
Temporally resolved decay curves of and emissions with excitation into for . Solid lines are fitted with a multiexponential decay.
Variation of QE for as a function of content with excitation at 210 and .
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