The luminescence properties of yttria based phosphors and study of YBO3 formation via H3BO3 addition

Abstract

In this paper, Y 2 O 3 :Eu 3+ nano-phosphor was synthesized through the facile solid-state method and influence of H 3 BO 3 addition to the prepared Y 2 O 3 :Eu 3+ powder was investigated. The consumption of boric acid resulted in the formation of YBO 3 by changing the crystal structure from cubic to hexagonal. Noteworthy, through the use of specific quantities of H 3 BO 3 (medium amount), Y 3 BO 6 impurity with the monoclinic crystal structure and the space group C2/m was formed. FESEM observations showed that the addition of H 3 BO 3 leads to the coarsening of the synthesized particles; changing from approximately 80 nm to 1 µm. Also, it was concluded that the transformation of the crystal structure causes a dramatic change of phosphor emission colours from reddish to orange.

An Effect of Boric Acid on the Structure and Luminescence of Yttrium Orthoborates Doped with Europium Synthesized by Two Different Routines

“…It was confirmed that the high-energy ball milling process reduced the particle size and improved the asymmetric ratio or color purity [14]. It was found that the addition of H 3 BO 3 not only increases the particle size from approximately 80 nm to 1 µm, but also changes the crystal structure from cubic to hexagonal (belonging to YBO 3 ) [15,16].…”

“…The slight broadening indicates the presence of no molecular water in the form of structure-forming OH groups. The band at 676 cm −1 is assigned to vibrations of the [BO 3 ] 3− structural group, the B-O-B bridge, or to vibrations of the atoms that form [B(O, OH) 4 ] tetrahedrons [14,15]. The band at 1194 cm −1 was probably caused by vibrations of atoms in the -O-B< bond in the structure of orthoboric acid.…”

Structural and Luminescence Characterization of Yttrium-Based Red Powder Phosphors

“…So, they provide a symmetry center resulting in a strong 5 D0− 7 F1 transition [7]. Also, the addition of boric acid leads to changes in the crystal structure from cubic to hexagonal (belonging to YBO3) [8].…”