Photon Quantization in Sm3+ Doped Red Glass Phosphors for Laser‐Induced Illumination

Abstract

Multi‐peak red fluorescence emissions in Sm3+‐doped multicomponent‐alkali‐alkaline‐borate (MCAAB) glasses for laser‐induced illumination are quantitatively characterized, revealing that the quantum yield (QY) is closely related with the wavelength of pumping sources. Under the excitation of 370 nm UVA‐LED, the net emission photon numbers of 1.00 wt% Sm2O3‐doped MCAAB glasses are derived to be 58.0 × 1012 cps, and the QY reaches to 25.3% which is about twice as much as 12.2% under 469 nm blue‐LED pumping, which is attributed to the better excitability in UVA spectral region. In order to extend the effective excitation range to UVB, Ce3+ is co‐doped in Sm3+‐doped MCAAB glasses as a sensitizer, which results in an enhancement of Sm3+ excitation intensity by a maximum sensitization factor of 9.16 in the UVB region. Absolute spectral parameters under 453 nm blue laser excitation exhibit that net emission photon numbers are up to 199.4 × 1012 cps in 1.00 wt% Sm2O3 doping case, and QY is solved to be 6.2%. Higher QY of the Sm3+‐doped MCAAB glasses is expected to be achieved by further adopting wavelength‐matched pumping laser, implying that Sm3+‐doped MCAAB glasses is a promising candidate as high power‐density light source in special laser‐induced illumination.