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Preparation and Iuminescence of Single Matrix Phosphors for White Light-emitting Diodes

Author: LiZiQiang
Tutor: LiZhiQiang
School: Hebei University
Course: Optical Engineering
Keywords: single matrix white-LED energy transfer phonon energy
CLC: O482.31
Type: Master's thesis
Year: 2013
Downloads: 52
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Abstract


In this paper, several kinds of single matrix phosphors used for ultraviolet LED were prepared by high temperature solid reaction and hydrothermal method. The crystal structures were analyzed. There is a study on the luminescent properties by changing the kinds of activator, co-active and the doped concentration. The main contents are given below:(1) A series of phosphors KCaM(PO4)2:Dy3+(M=La, Y, Lu) were synthesized by a high temperature solid state reaction method. The crystal structures and luminescent properties were analyzed. Under the excitation of365nm, the white light emissions were observed. And the corresponding of meter of Dy3+in the crystal and the different metal cation (M) were studied.(4) The luminescent properties of the single white emitting phosphor Tb3+, Eu3+co-activated KCaY(PO4)2were studied. As a result of Tb3+ions in the presence of the cross-relaxation, tunable emission from the greenish-blue to yellowish-green region was obtained by changing the doping concentration of Tb3+. Luminescence properties and interactions between Tb3+and Eu3+were studied. The result shows that there is an energy transfer process from Tb3+-Eu3+and white light emissions.(2) The Eu3+doped CaY2In6O13and Ba5GdsZn4O21white light emitting phosphors were synthesized. The phonon energy was analyzed, which is helpful to get the emissions from5D1,2,3of Eu3+. And the effect of the concentration of Eu3+to the emission intense has been investigated. The white light emissions, which can be excited effectively by ultraviolet chips, were obtained when the Eu3+doped at0.01mol-1and0.005-0.02mol-1.(3) Tricolor phosphors were obtained from Ca4Y6Si6025doped by Ce3+, Eu2+and Eu3+With the appropriate ratio among the tricolor phosphors, a high-quality white light emission will beacquired.

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CLC: > Mathematical sciences and chemical > Physics > Solid State Physics > Solid nature of the > Optical Properties > Luminescence
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