Red, White and Blue Light Emission from Europium Doped Al2O3 Confined into a Silica Matrix

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 Al 2 O 3 :Eu 3+ @SiO 2 were successfully synthesized by the hydrolysis and condensation reactions of TEOS as the raw precursor of silica matrix on the Al 2 O 3 :Eu 3+ surface. With the aim to change the CIE coordinates different weight ratios of Al 2 O 3 :Eu 3+ /SiO 2 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; I red /I blue , between the red emission coming from the 5 D 0 → 7 F 2 transition of Eu 3+ 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 SiO 2 transformation is carried out.

Spectroscopic analysis of Eu3+ doped silica–titania–polydimethylsiloxane hybrid ORMOSILs

“…In many recent works, silica is effectively used as the host matrix to incorporate the rare-earth ions so that these ions can be protected from the environmental effects and can enhance emission intensity. 5 Also, the binary matrices such as TiO 2 -SiO 2 and TiO 2 -ZrO 2 doped with RE ions were widely examined during the last decades as they nd applications in lasers, lighting and displays, up-conversion and white light emission. [6][7][8][9] However, the surface defects and lattice distortions in these host matrices adversely inuence the luminescence properties of the RE ions which leads to quenching of luminescence.…”