Alkaline Earth Halophosphate Phosphors Activated by Divalent Europium

Abstract

A new class of phosphors is described based on alkaline earth halophosphates possessing spodiosite and apatite structures as host matrices for lanthanide ion activators. The materials are presented in terms of the formulations used for their synthesis; these formulations have pronounced effects on efficiency and spectral properties of the final compositions. Divalent europium is the principal activator considered.

Metasomatism in the North Qôroq centre, South Greenland: apatite chemistry and rare-earth element transport

“…Initial studies of CL in apatites concerned synthetic apatites (Quirk and Thomas, 1964;Palilla and O'Reilly, 1968) and work on natural apatites soon followed (Smith and Steenstrom, 1965;Portnov and Gorobets, 1969). Natural apatites were seen to luminesce in a variety of colours and the above workers stressed the importance of Mn 2 § and REE contents in controlling both intensity and colour.…”

Photoluminescence characterization of Dy3+ and Eu2+ ion in M5(PO4)3F (M=Ba, Sr, Ca) phosphors

“…Synthetic alkaline earth fluoride-phosphates doped by divalent europium and trivalent dysprosium are efficient photoluminescent materials. The europium activated phosphor is used as blue component in three band fluorescent lamps, LED [11][12][13] and dysprosium doped phosphors are used as tricolor component in fluorescent lamps [14,15], and white LED [16,17]. In these devices, luminescent materials absorb the energy generated from cathode ray or ultraviolet (UV) radiation and then convert it to visible light [18].…”

Photoluminescence and thermoluminescence characterization of Eu3+- and Dy3+ -activated Ca3(PO4)2 phosphor

“…Phosphate-based materials require one-quarter less energy compared to incandescent light bulbs, which has been studied by modified solid-state diffusion technique [1]. In recent years, there is immense growth in advanced technologies such as tunable LEDs [2], Hg-free lamp phosphor [3], CFL [4,5], field emission display, electroluminescence, CRT projection displays [6], detectors for X-ray imaging [7][8][9] and scintillation detectors [10]. Special attention has been paid in this paper to develop the rareearth-doped phosphors, which gives switching behavior.…”