Propriedades de luminescência em vidros fluorogermanatos dopados com disprósio

Abstract

Currently the technology based on LEDs is considered the fourth generation in lighting and have received particular attention due to studies of techniques for generating white light using vitreous materials that were developed for application in photonics and biophotonics. LEDs present many advantages when compared with the lighting techniques that were developed to the present day, as for example the low power consumption, high light efficiency, long life, among others. In this work we present the study of optical and spectroscopic properties of glassy matrix PbGeO 3 : PbF 2 : CdF 2 doped with the rare-earth ion dysprosium (Dy 3+ ), with the goal of producing white light in the region of low color temperature, this is a region of interest because the illumination generated by LEDs can be controlled. The glassy matrix we use, Dy 3+ doped presents bands defined in the visible region, when excited by UV sources (375 nm, 385 nm) and/or blue (405 nm), of which the LED source (385 nm) presents better results when compared with laser sources (375 nm and 405 nm). These bands present emissions in the regions of blue, yellow and red, allowing the color temperature to be in a range around 2700 K to 3000 K, which ensures low color temperature. The results in this study suggest that the matches currently used, in particular the metagermanate of lead, presenting an important contribution for a variety of applications, including the technology-based white LEDs lighting.