Powerful visible (530�??770 nm) luminescence in Yb,Ho:GGG with IR diode pumping

Abstract

Powerful visible luminescence in a Gadolinium Gallium Garnet (GGG) crystal, co-activated with Yb3+ (~15 at.%) and Ho3+ (~0.1 at.%) ions, is investigated under CW laser diode pumping (lambda = 938 and 976 nm). The main visible emission band is observed in the green with its peak at lambda ~540 nm) and measured to be about 10% with respect to Yb3+ IR luminescence (lambda ~1000 nm). Red (lambda ~650 nm) and near-IR (lambda ~755 nm) emission bands are also observed but are weaker (about 3-5%). Analysis of the crystal absorption and luminescence spectra allows one to conclude that Yb3+ - Ho3+ stepwise up-conversion is the mechanism explaining the phenomenon. Ho3+ ions embedded in the crystal in small concentration are shown to form an effective reservoir for energy transferred from the excited Yb3+ subsystem and to be an efficient source of the visible emission.

Structural and luminescence investigation on gadolinium gallium garnet nanocrystalline powders prepared by solution combustion synthesis

“…It is also a very good host for doping with rareearth ions. All these properties make doped or undoped GGG crystals very suitable for numerous technological applications, for instance as substrates for yttrium iron garnet (YIG) and YIG-like magneto-optical films [4][5][6] and as materials for solid-state lasers [7,8].…”

“…The luminescence properties of GGG single crystals doped with trivalent lanthanide ions have been studied in detail [7,8,[23][24][25]. In recent years it has been shown that nanocrystalline lanthanide-doped GGG samples, obtained by the propellant technique, have very interesting luminescence properties [26][27][28][29].…”

Structure and charge density of Ce doped gadolinium gallium garnet (GGG)

“…It has been a subject of intense research for the past three decades, because it is a very good host for doping with rare-earth ions [2]. Various authors [3][4][5][6] have studied the luminescence properties of GGG crystals doped with lanthanide ions. Suchocki et al [7] have studied the temperature dependence of the luminescence properties of GGG crystals co-doped with Yb and Ho crystal.…”

Nanocrystalline lanthanide-doped Lu3Ga5O12garnets: interesting materials for light-emitting devices

“…Among oxidebased materials, garnets have gained a considerable degree of attention due to their interesting chemical and physical properties such as high density, high thermal conductivity and hardness, and good chemical stability [6]. Many investigations on the luminescence properties of lanthanidedoped garnets have shown that they can be usefully employed as laser crystals, phosphors and upconverter materials [7][8][9][10]. In this class of materials, the luminescence properties of lutetium-based garnets, such as La 3 [11][12][13][14][15][16] doped with lanthanide ions are particularly promising.…”