TITLE:
Red, White and Blue Light Emission from Europium Doped Al2O3 Confined into a Silica Matrix
AUTHORS:
Joan Reyes, Dulce Y. Medina, Miriam Aguilar, Miguel A. Barron, Elizabeth Garfias, Angel de Jesus Morales
KEYWORDS:
Luminescent Lanthanide, Luminescence, White Emission, Aluminium Oxide
JOURNAL NAME:
Open Journal of Applied Sciences,
Vol.8 No.8,
August
9,
2018
ABSTRACT: The main drawbacks of fluorescent activated lanthanide luminescent
materials in practical optoelectronic applications are the high cost of raw material and the limitation of
a specific color depending on the lanthanide ion. In this work, the synthesis of red, white and blue
light emitting composite powders of Al2O3:Eu3+@SiO2 were successfully synthesized by the hydrolysis and condensation reactions of
TEOS as the raw precursor of silica matrix on the Al2O3:Eu3+ surface. With the aim to change the CIE coordinates different weight ratios of
Al2O3:Eu3+/SiO2 powders from 13Al/87Si to
5Al/95Si were prepared. Besides, various excitation wavelength from 280 to 340
nm was used in order to change the ratio intensity; Ired/Iblue, between the red
emission coming from the 5D0→7F2 transition of Eu3+ ions and the blue band of silica matrix. Chemical
evolution of the hydrolysis and condensation reaction of TEOS were conducted by FTIR spectroscopy. The results indicate that
from 500°C a complete TEOS to SiO2 transformation is carried out.