Tungstate Makes LED Colorful
Tungstate is the most classic one of the inorganic luminescent materials, as early as in 1896, scientists found that CaWO4 can be applied to X-ray emission.
In 1906 for the first time to be used as X phosphor materials, tungstate materials quickly penetrate into all aspects of human life. In 1948, people found that the brightness of tungstate with compound purity increases, tungstate can be launched by some elements, these rare earth elements doped tungstate lattice, can make it shine with special properties.
In recent years, the energy-saving lighting industry has developed vigorously. However, the efficient lighting products are unable to avoid the mercury pollution problems while saving electricity and reducing energy consumption, with the developing of tungstate phosphors, LED has gradually become the market mainstream. Tungstate phosphors are those that can absorb energy (the absorbed energy including electromagnetic wave (including visible light, ultraviolet X rays, ), electron beam or ion beam, thermal and chemical reaction), and then through the energy conversion after the release of visible light material.
In the lighting, the LED light-emitting principle is different colors are added with different fluorescent powder, we see the white LED itself is not white, is generally blue light to stimulate the yellow fluorescent light emitting white light, the main material is mostly phosphor tungstate, with rare earth tungstate, similar to the color palette, tungstate blends many colors for LED.
The tungstate phosphor has been used in the presence of mono succinates and two tungsten hydrochloric acid of the CaWO4 scheelite structure. But recently, the application of tungstate doped with rare earth ions such as Eu3+, Tb3+ and Dy3+ has become very active in the field of white LED, and its applications have become more and more widely.
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