Irradiation with X-rays, cyclotron, reactor, and other kinds of radiation changes the valences of some impurities or favors intensification of the existing color cent-ers or formation of new ones. After irradiation, colorless and pink sapphires acquire orange color. There is no point in irradiating ruby, since this worsens the purity of its color.
Implantation of cobalt ions with 5 ⋅ 10 16 to 5 ⋅ 10 17 ion/cm 2 doses and an energy of 20 keV into leucosapphire leads to the appearance of gray color. Subsequent heating in air transforms the color from green (1,070 К, 3 h) to light blue (1,270 К, 3 h). The X-ray and photoelectron spectra of Co also change: the spectrum of the nonannealed sample nearly coincides with that of the pure metal. The spectrum of the annealed sample has two maxima corresponding to bands at 779 eV and 781.4 eV. This fact indicates the presence of two types of electronic configuration of Co in colored sapphire.
Although there are lots substrates which are regarded as potential materials to replace sapphire substrate, it is still dominated in the substrates (for GaN LED growth) market, because of its reasonable price and relatively low mismatch. Zhongju is capable of processing substrates according to customer needs. Currently, our sapphire substrate productions ranges from 2 to 12 inches with high quality and accurate orientation.
ShanXiZhongJuJingKe Semiconductor Co., Ltd
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Address: No.2, machinery park, huitong industrial park, jinzhong development zone, shanxi demonstration zone,Jinzhong,Shanxi