photoluminescence spectrum room-temperature photoluminescence spectrum RT-PL spectrum room-temperature photoluminescence spectra room temperature photoluminescence spectrum RT-PL spectra room temperature photoluminescence spectra A plot of intensity vs. wavelength obtained by measuring the amount of radiation emitted by a sample through photoluminescence (emission of visible light) against the frequency of the incident radiation at room temperature. RTPL spectrum RTPL spectra CHMO:0000866