Orange red fluorescent powder for LED (Light Emitting Diode) and preparation method thereof

A fluorescent powder and orange-red technology, applied in the field of rare earth luminescent materials, can solve the problems of poor color rendering, low efficiency, and unstable performance, and achieve stable physical and chemical properties, high energy conversion efficiency, and simple synthesis methods Effect

Active Publication Date: 2012-09-26

CHINA JILIANG UNIV

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AI-Extracted Technical Summary

Problems solved by technology

At present, the commercial products are mainly single-chip high-brightness white LEDs composed of blue LED chips and yellow light of YAG phosphor powder. As a result, the color rendering is not good, and red phosphor can be added to obtain a high color rendering index

However, in the prior art, some ph...

Abstract

The invention discloses orange red fluorescent powder for an LED (Light Emitting Diode), which is tervalent samarium activated tellurate fluorescent powder and has a chemical formula of (Ma-2xSmxAx)TebOc, wherein M is at least one of Ca, Sr and Ba; A is at least one of Li, Na and K; a is more than or equal to 1 but less than or equal to 3; b is more than or equal to 1 but less than or equal to 4; c is more than or equal to 3 but less than or equal to 11; and x is more than 0 but less than 0.1. The invention also discloses a preparation method for the compound, which comprises the following steps of: uniformly milling and mixing monomers, compounds or corresponding salts of M, Te and Sm and the compounds or corresponding salts of A; roasting at high temperature; and smashing, cleaning, removing impurities, and drying, and then processing, thereby obtaining the orange red fluorescent powder for the LED. The orange red fluorescent powder has the characteristics of wide excitation wavelength range, high efficiency, stability, and the like; the preparation method is simple; no pollution is caused; the cost is low; and the orange red fluorescent powder can be used for manufacturing a white light LED by using a purple light or ultraviolet light LED chip.

Application Domain

Gas discharge lamp usageLuminescent compositions +1

Technology Topic

Excitation wavelengthWhite light +8

Image

Examples

Experimental program(6)

Example Embodiment

[0019] Example 1: Weighing CaCO 3 4.5321g, TeO 2 7.3736g, Li 2 CO 3 0.0171, Sm 2 O 3 0.0806g, the above raw materials are all analytically pure. After the weighed raw materials are mixed and milled uniformly, they are put into an alumina crucible and calcined in the air, and kept at 650 ° C for 3 hours. After cooling, take out and pulverize, grind, wash with water to remove impurities, and dry to obtain the chemical composition of Ca. 0.98 Li 0.01 TeO 3 : 0.01Sm 3+ of orange-red phosphors for LEDs. Its emission spectra under excitation at 405 nm and 375 nm are shown in figure 1 and figure 2 , the main emission peak is 602 nm. The excitation spectrum obtained by monitoring the 602 nm emission is shown in image 3. It can be seen from the figure that the phosphor can be effectively excited by ultraviolet or violet light in the range of 340 nm to 420 nm, and has a wide range of uses.

Example Embodiment

[0020] Example 2: Weighing CaC 2 O 4 11.0646g, TeO 2 4.7867g, Na 2 C 2 O 4 0.1206g, Sm 2 O 3 0.3138g, the above raw materials are all analytically pure. After the weighed raw materials are mixed and milled uniformly, they are put into an alumina crucible and calcined in air, and kept at 700°C for 1 hour. After cooling, take out and pulverize, grind, wash with water to remove impurities, and dry to obtain the chemical composition of Ca. 2.88 Na 0.06 TeO 6 : 0.06Sm 3+ of orange-red phosphors for LEDs.

Example Embodiment

[0021] Example 3: Weighing Sr(NO 3 ) 2 7.5711g, TeO 2 6.0758g, Li 2 CO 3 0.0423g, Sm(NO 3 ) 3 0.3841g, the above raw materials are all analytically pure. After the weighed raw materials are mixed and milled uniformly, they are put into an alumina crucible and calcined in the air, and kept at 700 ° C for 3 hours. After cooling, take out and pulverize, grind, wash with water to remove impurities, and dry to obtain the chemical composition of Sr 0.94 Li 0.03 TeO 4 : 0.03Sm 3+ of orange-red phosphors for LEDs.

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Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Improve energy conversion efficiency
Stable physical and chemical properties

Orange red fluorescent powder for LED (Light Emitting Diode) and preparation method thereof

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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