Fluorescent powder capable of exciting continuous spectrum with blue light and preparation method of fluorescent powder

Abstract

The invention relates to fluorescent powder capable of exciting continuous spectrum with blue light and a preparation method of the fluorescent powder. The fluorescent powder can be used for manufacturing a white light-emitting diode, and has an excitation spectrum range of 450-500nm and an emission spectrum range of 440-700nm. A structural formula of the fluorescent powder is MLa2-x-yZnO5:EuxRy, wherein M consists of one or more of Mg, Ca, Sr and Ba, R consists of at least one of Tb, Dy, Pr, Ce and Mn, x and y are mole coefficients, x is more than 0.01 and less than 0.5, and y is more than 0.0001 and less than 0.2. The preparation method comprises the steps as follows: preparing raw materials by stoichiometric number according to the structural formula of MLa2-x-yZnO5:EuxRy, adding an fluxing agent, carrying out wet mixing by de-ionized water, carrying out ball milling, drying, roasting in reducing atmosphere, and post-processing to obtain the fluorescent powder. The processes of selecting, mixing, reducing and post-processing and the like of raw materials such as a matrix, an activator and the like are involved. The fluorescent powder has the characteristics that the light emitting brightness is high, the particle sizes are uniform, the emission wavelength can be adjusted as needed, the chemical stability is good, and the like; and the preparation method is simple, pollution-free and low-cost.

Description

Technical field [0001] The invention relates to a fluorescent material, in particular to a fluorescent material for white light and multicolor light emitting devices including semiconductor light emitting elements, and provides a method for preparing the fluorescent powder, belonging to the field of luminescent materials or semiconductor lighting. Background technique [0002] With the breakthrough of the third-generation semiconductor material gallium nitride and the advent of blue, green, and white light-emitting diodes, LED (light-emitting diode), known as the "technology of lighting the future", gradually approached us Daily life, and will lead us to a brighter future. The third-generation semiconductor material, gallium nitride, is used as the semiconductor lighting source. Under the same brightness, the power consumption is only 1 / 10 of that of ordinary incandescent lamps, and the life span can reach more than 80,000 hours. A semiconductor lamp can be used for more than 50 ...

AI Technical Summary

Problems solved by technology

In this method, the fluorescent material used has great limitations in the application and performance of white LEDs: First, the excitation range of this fluorescent material is in the range of 420-490nm, and the most effective excitation is in the range of 450-470nm In the short-wavelength region of ultraviolet light, visible light and green light region, it is not excited; secondly, the emission spectrum of this rare earth garnet structure phosphor can reach 575nm, and the lack of red components results in a low color rendering index of white LEDs.

The green fluorescent material described in this patent has a wide excitation spectrum, but the luminous color is single; and the red fluorescent material has a weak luminous intensity, which cannot be matched with existing phosphors, and has great limitations in practical applications.

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