Bismuth ion-doped germinate white light phosphor and preparation method thereof

Abstract

The invention provides a bismuth ion-doped germanate phosphor material and a preparation method thereof. The chemical composition formula is GeRxBi1-xO3, where x=0.01~1; R is any one of MgO, CaO, SrO, and BaO. Or several. Weigh Bi2O3, GeO2, and R according to their chemical composition (Ge: R: Bi = 1: x: 1-x), and then mix them evenly; the resulting mixture is heated to 1000~1400°C, kept warm for 0.5~6 hours, and cooled with the furnace temperature ; The calcined mixture is kept at 900-1300°C with reducing gas flowing for 1-3 hours, and then cooled with the furnace temperature to obtain bismuth ion-doped germanate white light phosphor. With high-efficiency response characteristics, the phosphor has good chemical stability, requires less raw materials for preparation, has a simple preparation method, and can effectively reduce costs; it matches well with near-ultraviolet LED chips, and has high visible light luminescence intensity and luminescence under near-ultraviolet light excitation. It has a wide band and good color rendering, which can reduce the need to match other facial phosphors.

Description

technical field

[0001] The invention relates to a germanate white light phosphor doped with bismuth ions and a preparation method thereof, belonging to the technical field of fluorescent materials. Background technique

[0002] As a new type of lighting source, all-solid-state white light emitting diodes (LEDs) have many advantages in energy saving, stability, and environmental protection compared with incandescent lamps and energy-saving lamps that are widely used at present. Therefore, the development of semiconductor lighting is conducive to improving the energy crisis and the environmental problems existing in the original incandescent lamps and energy-saving lamps. The realization of white light LED is based on the successful research and development of red, green and blue three primary color chips and various phosphors. At present, the common white light LEDs mainly include: using GaN-based blue light-emitting diodes with emitting yellow phosphors to produce white lig...

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