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

Abstract

Multi-peak red fluorescence emissions in Sm 3þ -doped multicomponentalkali-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% Sm 2 O 3doped MCAAB glasses are derived to be 58.0 Â 10 12 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, Ce 3þ is co-doped in Sm 3þ -doped MCAAB glasses as a sensitizer, which results in an enhancement of Sm 3þ 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 Â 10 12 cps in 1.00 wt% Sm 2 O 3 doping case, and QY is solved to be 6.2%. Higher QY of the Sm 3þ -doped MCAAB glasses is expected to be achieved by further adopting wavelength-matched pumping laser, implying that Sm 3þ -doped MCAAB glasses is a promising candidate as high power-density light source in special laser-induced illumination.

Microstructures and Luminescent Properties of Sm3+‐Doped KSr2Nb5O15 Prepared by Molten Salt Synthesis Method

“…As shown in the inset plot of Figure 6d, the average lifetimes of Sm 3þ -doped KSN phosphors reduced from 1.37 to 1.04 ms with the enhancement of Sm 3þ doping concentration, which could be explained that the possibility of energy migration to the luminescent killer sites enhanced with the increase of Sm 3þ concentration, and enhanced the probabilities of the nonradiative energy transfer and cross-relaxation. [39][40][41] Further analysis about the structural modulation of luminescent properties was carried out about the environment around Sm 3þ in KSN lattice. Based on the selection rule, magnetic doublet (MD) transitions will be allowed when the difference of angular momentum ΔJ ¼ AE1 and 0.…”

Improving white light emission and quantum yield of Ce@Eu co‐doped silicate glass by reducing Eu3+ to Eu2+ with Si3N4

“…12,16,18,[33][34][35][36][37][38] In the transmittance aspect, the highest transmittance of our work can reach 88%, higher than almost all the PIG method luminescent glass. In the QY aspect, recently reported no matter whether quantum dot NC 31,37 glass or other systems are lower than 32%, [39][40][41] Sample A of this work can reach a better performance at 36.02%. In addition, the CRI is 71.2.…”