Preparation and Luminescence Properties of Ca9NaZn(PO4)7:Dy3+ Single-Phase White Light-Emitting Phosphor

Symmetry Inhomogeneity of Ca9–xZnxEu(PO4)7 Phosphor Determined by Second-Harmonic Generation and Dielectric and Photoluminescence Spectroscopy

“…For Ca 9 NaZn(PO 4 ) 7 :Dy 3+ energy transfer was not observed. However, this phosphor is highly stable and generates white emission . Joint doping by Eu 2+ , Eu 3+ , and Tb 3+ in Ca 9 NaZn­(PO 4 ) 7 allowed obtaining a phosphor with tunable emission from ruddy violet to warm white and yellowish-green due to Eu 2+ → Tb 3+ and Tb 3+ → Eu 3+ energy transfer …”

“…However, this phosphor is highly stable and generates white emission. 17 Joint doping by Eu 2+ , Eu 3+ , and Tb 3+ in Ca 9 NaZn(PO 4 ) 7 allowed obtaining a phosphor with tunable emission from ruddy violet to warm white and yellowish-green due to Eu 2+ → Tb 3+ and Tb 3+ → Eu 3+ energy transfer. 18 The M4 site is fully vacant in compounds with the general formula Ca 8 ZnR 3+ (PO 4 ) 7 .…”

Anti-thermal quenching phosphors based on the new phosphate host Ca3.6In3.6(PO4)6

“…S5, † which is higher than that reported for some phosphors, for example, Ca 9 Gd (PO 4 ) 7 :Dy 3+ (IQE = 19.9%), 58 and Ca 9 NaZn(PO 4 ) 7 :Dy 3+ (IQE = 19.2%). 59 Importantly, a white PC-LED was successfully fabricated by combining the C 1−x IP:0.03Dy 3+ phosphor and UV 365 nm chip. The electroluminescence performances under different driving currents were tested (Fig.…”

A multi-centre activated single-phase white light phosphor with high efficiency for near-UV based WLEDs

“…10,12 The first is doping single rare-earth ions into certain hosts, such as narrow-band emitting BiF 3 :Tb 3+ , CaIn 2 O 4 :Eu 3+ and Ca 9 NaZn (PO 4 ) 7 :Dy 3+ , or broadband emitting Ba 3 Lu 4 O 9 :Ce 3+ and (Rb, K) 2 CaPO 4 F:Eu 2+ . [13][14][15][16][17] Nevertheless, the f-f forbidden transitions of Tb 3+ , Eu 3+ and Dy 3+ make the quantum efficiency of the former too low to meet the requirements of WLED applications, for example, the internal quantum efficiencies of CaIn 2 O 4 :Eu 3+ , Ca 9 NaZn(PO 4 ) 7 :Dy 3+ and BiF 3 :Tb 3+ are 10%, 19.2% and 3.44%, respectively. Although the quantum efficiency of the phosphors adopting f-d allowed transitions is significantly increased, the application of such phosphors in high-quality WLED devices is still restricted by the imbalance of emission spectra.…”