Effect of Calcination Temperature and Concentration on Luminescence Properties of Novel Ca₃Y₂Si₃O₁₂:Eu Phosphors

Abstract

In the present work, nanocrystalline Ca3Y2(1−x)Si3O12:Eux (x=1, 5, 10, and 20 mol%) novel phosphors were synthesized by a sol–gel method. The effect of temperature and concentration on structural and luminescence properties of nanocrystalline powders were investigated under UV excitation. The X‐ray diffraction profiles showed that all peaks could be attributed to the orthorhombic Ca3Y2Si3O12 doped Eu phase at the various calcination temperatures with various concentrations. Scanning electron microscopy was carried out to understand the surface morphological features and grain sizes. Photoluminescence (PL) measurements exhibited the presence of all transitions of Eu3+ dopant, being the 5D0→7F2 transition the most intense under the charge transfer band and it was observed to be located at around 250 nm. It was also found that, the PL intensity was strongly dependent on both the calcination temperature and dopant concentration. The highest PL intensity was observed for x=5 mol% with temperature at 1000°C. It was observed that the spectral features possess sharp and bright emission for potential applications on the flat panel displays and some other related electronic systems, in observing the images of red color.

Citric based sol–gel synthesis and luminescence characteristics of CaLa2ZnO5:Eu3+phosphors for blue LED excited white LEDs

“…It consists of lines in the orange and red spectral region exhibiting the characteristic f-f transitions of Eu 3+ . They are 5 D 1 → 7 F 1 (541 nm), 5 D 1 → 7 F 2 (557 nm), 5 D 0 → 7 F 0 (582 nm), 5 D 0 → 7 F 1 (590 and 598 nm), 5 D 0 → 7 F 2 (615 and 627 nm) and 5 D 0 → 7 F 3 (654 nm) respectively [22][23][24]. It can be seen from this figure that the spectra is dominated by the prominent band at 627 nm due to the 5 D 0 → 7 F 2 transition.…”

The effect of flux materials on the physical and optical properties of Eu3+-activated yttrium oxide phosphors

“…8(b) shows when we measure the emission spectrum with 270 nm excitation, and the peak intensity is 75% higher than that of a commercial phosphor. This red-shift is due to the increase of covalency in Eu-O bonding [16], which might be caused by reaction enhancer, i.e., BaF 2 material.…”

Photoluminescence and structural properties of Ca3Y(VO4)3:RE3+ (=Sm3+, Ho3+ and Tm3+) powder phosphors for tri-colors

“…These so called RE elements have a partially filled inner (4f n ) shell shielded from its surroundings by completely filled outer (5s 2 and 5p 6 ) orbitals. Due to shielding, the intra-4f shell transitions result in very sharp optical emissions at wavelengths from ultraviolet to infrared [13,14]. On realizing the relevance and importance of these RE doped vanadate based phosphors, in the present work we have carried out systematic optical characterization of RE ions (Sm 3 + , Ho 3 + and Tm 3 + ) doped CYV powder phosphors.…”