Abstract
SrY2O4 phosphors were doped with different concentrations of Eu3+ (0.5, 1, 2, 4, 8 and 10 at %) in order to investigate the maximal doping concentration of Eu3+ and its implementation in solar cell devices. Samples were synthesized by a combustion method using citric acid and glycine as a fuel. The X-ray diffraction (XRD) patterns confirmed pure phase of SrY2O4. FE-SEM micrographs showed agglomerate phenomenon with spherical-like shape particles and diameter of about 50 nm. Upon excitation with 280 nm, emission spectra were recorded in the range from 450-750 nm and in all samples the same energy transitions were observed 5D0 ? 7FJ (J = 1, 2, 3 and 4) with maximal intensity for sample with 8 at % of Eu3+. That sample was further examined for the purpose of application in solar cell devices and showed high value of efficiency at low light intensities.
Highlights
In a last couple of decades, phosphors are indispensable materials for applications in solid state lighting, especially in the form of light emitting diodes (LEDs) [1, 2]
SrY2O4 phosphors were doped with different concentrations of Eu3+ (0.5, 1, 2, 4, 8 and 10 at %) in order to investigate the maximal doping concentration of Eu3+ and its implementation in solar cell devices
Phosphors doped with rare earth ions give rise to strong emissions and plays important role in modern display technology, such as plasma display panel (PDP), white light emitting diodes (WLEDs), field emission display (FED) and in industry lighting, such as tricolor lamps and solar cells [3,4,5,6,7]
Summary
In a last couple of decades, phosphors are indispensable materials for applications in solid state lighting, especially in the form of light emitting diodes (LEDs) [1, 2]. The SrY2O4 lattice belongs to the CaFe2O4 related structure consisting of one strontium and two yttrium sites, both of inversion symmetry It is usually doped with Ce3+, Eu3+, Dy3+ and Sm3+ for down-conversion luminescence, with Yb3+/ Er3+ for up-conversion as well as doped with Tb3+/Tm3+/Dy3+ for producing white light [20,21,22,23]. The SrY2O4 doped with Eu3+ is known as a promising down-conversion red phosphor since it give rise to strong emission at approximately 610 nm At first, this material was produced using solid state reaction [24]. Starting materials for obtaining Eu3+ doped SrY2O4 were rare earth nitrates, yttrium nitrate hexahidrate (Y(NO3)3⋅6H2O) and europium nitrate hexahidrate (Eu(NO3)3⋅6H2O, Alfa Aesar (purity 99.9 %) and strontium nitrate Sr(NO3) purchesed from Alfa Aesar (99 %). All chemicals were analytical grade reagents and were used directly without further purification
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