A Garnet-Based Ca₂YZr₂Al₃O₁₂:Eu³⁺ Red-Emitting Phosphor for n-UV Light Emitting Diodes and Field Emission Displays: Electronic Structure and Luminescence Properties

Abstract

A series of CaYZrAlO:Eu (CYZA) phosphors were successfully synthesized through conventional solid-state method. The electronic structure and their photoluminescence or cathodoluminescence properties were investigated in detail. Under n-UV excitation, the CYZA:Eu exhibits more intense red emission than the commercial YO:Eu phosphor. A WLED lamp with good color render index was obtained by fabricating the phosphor with BAM:Eu and LuAG:Ce phosphors. The phosphor also exhibits red emission with high current saturation and high resistance under low voltage electron bombardment. The degradation resistance can be compared to the commercial YO:Eu phosphor. All the results indicate that the CYZA:Eu has potential applications in both white LEDs and FEDs.

Photoluminescence tuning in a novel Bi3+/Mn4+ co-doped La2ATiO6:(A = Mg, Zn) double perovskite structure: phase transition and energy transfer

“…Given the sensitivity of Bi 3+ ions to the coordination environment, the optical properties of LM (1-w) Z w T:0.005Bi 3+ , 0.002Mn 4+ (0 ≤ w ≤ 1) samples with varying w values are discussed in details. The optical band gaps of LMT and LZT hosts are firstly calculated by following formula based on the diffuse reflection spectra: [36][37][38] […”

Color Tuning in Garnet Oxides: The Role of Tetrahedral Coordination Geometry for 3 d Metal Ions and Ligand–Metal Charge Transfer (Band‐Gap Manipulation)

“…Thus, substitution at the "A" site by rare-earth ions such as Eu 3 + and Tb 3 + ions gives rise to intense red and green emissions. [13,14] Silicate garnet,C a 3 Cr 2 Si 3 O 12 ,d isplays an intense green color and is commercially known as VictoriaG reen. [15] Almandine, Fe 3 Al 2 Si 3 O 12 ,w ith the garnet structure exhibits a dark-redc olor.…”

Insight into a novel rare‐earth‐free red‐emitting phosphor Li3Mg2NbO6:Mn4+: Structure and luminescence properties

“…The local-density approximation (LDA) was adopted as the basis of density function. [32][33][34] . The diffuse reflectance spectra (DRS) were recorded on a UV-vis spectrophotometer (PE-lambda950) by using the BaSiO 4 power as the reference.…”