Effect of Cr3+ doping on structural and optical property of ZnGa2O4 synthesized by sol gel method

Orange‐Red‐emitting Ca9Gd(PO4)7:Eu3+ Phosphors: Judd‐Ofelt Analysis and Investigation on the Thermal Stability, Quantum Efficiency for WLED

“…For the optimized sample annealed at 1100 °C (with V= 3837 Å 3 , x c =7 % and N=2), the calculated R c value is about 8.06 Å, which is approximately close to the result obtained of Dalal et al [23] . This R c value is much greater than the threshold value for effective energy transfer (5 Å), indicating that the photoluminescence quenching mechanism is governed by the multipolar interaction [39,42,44,46] . It is reported that there are three main types of the multipolar interactions: dipole‐dipole, dipole‐quadrupole, quadrupole‐quadrupole interactions [42,46] .…”

“…The decrease of the PL intensity at the high doping concentration of 10 % could be due to concentration quenching effect [23,39–41] . It is reported that the particular mechanism of the quenching phenomenon in the photoluminescence intensity could be interpreted by studying the effective energy transfer through this critical distance (R c ) which could be estimated by this equation 2 [42–45] …”

“…This R c value is much greater than the threshold value for effective energy transfer (5 Å), indicating that the photoluminescence quenching mechanism is governed by the multipolar interaction [39,42,44,46] . It is reported that there are three main types of the multipolar interactions: dipole‐dipole, dipole‐quadrupole, quadrupole‐quadrupole interactions [42,46] . Based on the Dexter theory, the crucial part of multipolar interaction could be determined by this equation: [47–51] …”

Zinc Gallium Oxide—A Review from Synthesis to Applications

“…During this decade, oxide phosphors that emit multiple colors had been investigated widely for their applications in field emission display (FED), vacuum fluorescent display (VFD) and plasma display panels, and thin-film electroluminescent devices. Oxide phosphors exhibit higher chemical stabilities and thermal stabilities in a high vacuum than sulfide phosphors [13], and various luminescent properties such as photoluminescence (PL), cathodoluminescence (CL), and electroluminescence (EL) were investigated. Among them, PL layers and EL systems prepared by different methods have been systematically studied for the fabrication of flat panel displays, monitoring screens, and lighting systems [14].…”

Tuning the Photoluminescence Properties of β‐NaYF4:Yb,Er by Bi3+ Doping Strategy

“…The upconversion materials based on the anti-Stokes principle can emit a high-energy photon after absorbing two or more low-energy photons under near-infrared light excitation. [1,2] Its unique optical properties of absorbing near-infrared photons and emitting visible light signify wide application prospects in biomedical, [3] laser, [4] sensor, [5,6] and solar cells. [7,8] In commercial applications, luminescent efficiency is the key factor determining the application scope of luminescent materials.…”