A Potential Red Phosphor Na_0.5Gd_0.5MoO₄:Eu³⁺ For Light‐Emitting Diode Application

Abstract

The intense red‐emitting phosphor Na0.5Gd0.5MoO4:Eu3+ with tetragonal structure was prepared by solid‐state reaction and its photoluminescence properties were investigated. Compared with Y2O2S:0.05Eu3+, the obtained Na0.5Gd0.375MoO4:Eu0.1253+ phosphor shows a stronger excitation band near 400 nm as well as enhanced red emissions. The strong red‐emission lines at 616 nm correspond to the forced electric dipole 5D0→7F2 transitions on Eu3+. The chromaticity coordinates of Na0.5Gd0.375MoO4:Eu0.1253+ (x=0.652, y=0.348) are closer to the standard of National Television Standard Committee values (x=0.670, y=0.330) than that of Y2O2S:0.05Eu3+ (x=0.645, y=0.354). The optical properties suggest that Na0.5Gd0.375MoO4:Eu0.1253+ is an efficient red‐emitting phosphor for light‐emitting diode applications.

Effects of Sintering Temperature on the Morphology and Photoluminescence of Eu3+ Doped Zinc Molybdenum Oxide Hydrate

“…Normally the dopant concentration of rare-earth element in ZnMoO 4 varies in the range of 0.1-30 mol% [4][5][6][7][8]. It is known that the intensity of [4,8]. This is the reason why we simply selected 1 mol% of Eu 3+ as dopant in the host materials.…”

“…Zinc molybdate tetraoxide (ZnMoO 4 ), which can be utilized as cryogenic scintillating bolometers for neutrinoless double beta decay detection [1][2][3], has attracted interest in the last years as the host material for rare-earth ions [4][5][6][7][8]. As is well known, triclinic ZnMoO 4 is composed of a series of distorted Mo-O tetrahedrons, Zn-O pentahedrons, and Zn-O octahedrons.…”

“…For example, Zhou et [8]. Although characteristic emissions of the rare-earth dopants can be clearly identified in the rare-earth doped ZnMoO 4 , the high temperature treatment makes the reported approaches suffer from the drawback of being highly energy-consuming [4,7,8,10]. Thus synthesis of rare-earth doped ZnMoO 4 nanostructures on a large scale with low costs is a present challenge in nanotechnology, and it is necessary to develop an energysaving and cost-effective route to prepare rare-earth doped ZnMoO 4 .…”

“…Eu 3+ is a typical rare-earth dopant; the most prominent feature of Eu 3+ is its red emission at 616 and 628 nm due to its 5 D 0 → 7 F 2 . So we selected Eu 3+ as a representative of rareearth dopants to study the photoluminescence (PL) properties of rare-earth doped ZnMoO 4 . Normally the dopant concentration of rare-earth element in ZnMoO 4 varies in the range of 0.1-30 mol% [4][5][6][7][8].…”

“…So we selected Eu 3+ as a representative of rareearth dopants to study the photoluminescence (PL) properties of rare-earth doped ZnMoO 4 . Normally the dopant concentration of rare-earth element in ZnMoO 4 varies in the range of 0.1-30 mol% [4][5][6][7][8]. It is known that the intensity of [4,8].…”