Luminescent properties of Dy3+/Eu3+ doped fluorescent glass for white LED based on oxyfluoride matrix

Rare earth ion-doped fluorescent glass has become a hotspot due to its characteristics. This work shows that the prepared Dy3+ and Dy3+/Eu3+ doped glasses have white light emission under ultraviolet excitation. There is a higher yellow light/blue light (Y/B) value, indicating an increase in the covalentity of Dy-O, and decrease in the symmetry with the increasing concentration of dopants (Dy3+). The correlated color temperature (CCT) can be effectively reduced by the red light emission of Eu3+, and the order of influence of excitation wavelength on CCT is 395 nm > 382 nm > 365 nm. The delay curve demonstrates the energy transfer from Dy3+ to Eu3+. The glass has the characteristics of anti-blue light damage and wide tunable color temperature, which illustrates that it has potential application in the field of white LED. (c) 2021 Chinese Society of Rare Earths. Published by Elsevier B.V. All rights reserved.

Automated summary

The rare earth ion-doped fluorescent glass prepared in this study emits white light under ultraviolet excitation, with a higher yellow light/blue light value and the ability to reduce correlated color temperature. Energy transfer from Dy3+ to Eu3+ is demonstrated, achieving light emission conversion.