Rebrova Nadiia, Grippa Alexander, Zdeb-Stańczykowska Patrycja, Dereń Przemysław J
Institute of Low Temperature and Structure Research, Polish Academy of Science, ul. Okólna 2, Wrocław 50-422, Poland.
Institute for Scintillation Materials, National Academy of Sciences of Ukraine, Nauky Avenue, 60, Kharkiv 61001, Ukraine.
Inorg Chem. 2025 Jun 9;64(22):11146-11154. doi: 10.1021/acs.inorgchem.5c01458. Epub 2025 May 29.
Many pathogens, including bacteria and viruses, are increasingly developing resistance to conventional disinfectants. As a result, new approaches to disinfection are being explored, such as the use luminophores that convert visible light into ultraviolet C radiation (UVC). In this work, we present novel UVC phosphors, ALu(PO) (A = Sr, Ba), activated by Pr. These phosphates were synthesized by the Pechini method with different activator concentrations and crystallized in a cubic structure with the space group . The emission and excitation spectra, as well as decay times under synchrotron and visible-light excitation, were measured. Both phosphates exhibited efficient and fast 5d-4f emission from 240 to 340 nm, along with a very weak f-f emission line around 600 nm upon ultraviolet excitation. Multiphonon relaxation from the P to D state causes the phosphors to emit weak blue (P → H) and intense orange (D → H) light upon direct excitation of the P level. The upconversion properties of ALu(PO):Pr crystallites were investigated under 444 nm laser excitation, and the effect of Pr concentration on these properties was evaluated. Compared to the YPO:Pr reference material studied earlier, the BaLu(PO):Pr host showed a 20-fold enhancement in UVC upconversion emission, making this phosphate one of the most efficient visible-to-ultraviolet upconversion matrices to date. Thus, the studied phosphates have potential use in sterilization, disinfection, photocatalysis, and phototherapy.
包括细菌和病毒在内的许多病原体对传统消毒剂的耐药性日益增强。因此，人们正在探索新的消毒方法，例如使用能将可见光转化为紫外线C辐射（UVC）的发光体。在这项工作中，我们展示了由Pr激活的新型UVC荧光粉ALu(PO)（A = Sr、Ba）。这些磷酸盐通过佩琴尼法合成，具有不同的激活剂浓度，并以空间群为 的立方结构结晶。测量了同步加速器和可见光激发下的发射光谱、激发光谱以及衰减时间。两种磷酸盐在240至340 nm范围内均表现出高效且快速的5d - 4f发射，在紫外线激发下，还伴有一条位于600 nm左右非常微弱的f - f发射线。从P态到D态的多声子弛豫导致荧光粉在直接激发P能级时发出微弱的蓝光（P→H）和强烈的橙光（D→H）。在444 nm激光激发下研究了ALu(PO):Pr微晶的上转换特性，并评估了Pr浓度对这些特性的影响。与之前研究的YPO:Pr参考材料相比，BaLu(PO):Pr基质的UVC上转换发射增强了20倍，使其成为迄今为止最有效的可见光到紫外线的上转换基质之一。因此，所研究的磷酸盐在杀菌、消毒、光催化和光疗方面具有潜在用途。
