Improved Photoluminescence Performance of Eu3+-Doped Y2(MoO4)3 Red-Emitting Phosphor via Orderly Arrangement of the Crystal Lattice

Abstract

In this study, we developed a technology for broadening the 465 nm and 535 nm excitation peaks of Eu3+:Y2(MoO4)3 via crystal lattice orderly arrangement. This was achieved by powder particle aggregation and diffusion at a high temperature to form a ceramic structure. The powdered Eu3+:Y2(MoO4)3 was synthesized using the combination of a sol–gel process and the high-temperature solid-state reaction method, and it then became ceramic via a sintering process. Compared with the Eu3+:Y2(MoO4)3 powder, the full width at half maximum (FWHM) of the excitation peak of the ceramic was broadened by two- to three-fold. In addition, the absorption efficiency of the ceramic was increased from 15% to 70%, while the internal quantum efficiency reduced slightly from 95% to 90%, and the external quantum efficiency was enhanced from 20% to 61%. More interestingly, the Eu3+:Y2(MoO4)3 ceramic material showed little thermal quenching below a temperature of 473 K, making it useful for high-lumen output operating at a high temperature.

Studies on a novel SrZr2CaLa2O8:Eu3+ phosphor for lighting applications emitting direct white light

“…Figure 8 depicts the Eu 3+ energy transitions in the host matrix. Through the resonance process, excited electrons within the charge transfer band (CTB) could transfer energy to 5 D 3 or higher levels of Eu 3+ , and the energy relaxes to 5 D 1 or 5 D 0 states via a non‐radiative mechanism [27]. The distinctive emission of Eu 3+ then occurs because of the radiative process.…”

Thermally stable photoluminescence of Eu3+ doped strontium pyrophosphate: red emitting phosphor with high color purity

“…Trivalent rare earth ions with partially filled 4f orbital electrons are well screened from the surrounding chemical environment of the host ion by their 5s and 5p electrons which enhance the red emission of the activator ion. 10,11 There are several Eu 3+ -activated commercial phosphors available for red PL emission under UV-blue excitation, such as Y 2 O 2 S/Y 2 O 3 :Eu 3+ , which have relatively low photoluminescence conversion efficiency. Therefore, Eu 3+ -doped inorganic materials were developed with high efficiency and color purity.…”

Luminescent Properties and Charge Compensator Effects of SrMo0.5W0.5O4:Eu3+ for White Light LEDs

“…It is well known that Eu 3+ is an outstanding rare earth ion generating red light and can be effectively stimulated by blue light and UV light [ 10 , 11 , 12 , 13 , 14 ]. For instance, a new red phosphor Sr 3 NaSbO 6 :Eu 3+ doped with Eu 3+ was developed, and its emission spectra under excitation at 285 nm is located 500–700 nm, with the primary peak at 618 nm, indicating that this phosphor is a red phosphor that can be successfully stimulated by UV light [ 15 ].…”