Design and technological aspects of novel CdS quantum dots doped glass–ceramics

摘要

? 2022 Elsevier Ltd and Techna Group S.r.l.The poor thermal stability of current commercial white light emitting diodes (LED) fabricated using a blue chip, a yellow phosphor based on Ce-doped yttrium and lutetium aluminum garnets, red nitride phosphor and resins, restricts their application in fields where long service time and high power lighting systems are required. Incorporating garnet-based phosphors into a glass offers a possible way to remove the organic resins in LED encapsulation. In the present study, a glass-ceramics based on a sodium silicate glass matrix and cadmium sulfide quantum dots (CdS QDs) was prepared using a simple sintering technique. The technological aspects of glass-ceramics preparation and their influence on the luminescent and lighting characteristics of the material was described. At once, a glass with CdS QDs performs the functions of both a matrix and a phosphor emitting in the yellow and red spectral regions. The variation of the excitation energy allows to switch the ratio of the excited ceramic components that affects the spectral composition of luminescence. The synthesis conditions varied the quantum yield of luminescence in the wide range from 9.4 to 40.8, the correlated color temperature from 3622 to 6742 K, and the color rendering index from 60.0 to 96.8. The leading sample of glass-ceramics under blue light irradiation had the chromaticity coordinates nearly in the ideal white light region (0.3310, 0.3733). The obtained glass-ceramics might be used as effective luminescent material for the manufacture of white emitters.