Eu doped CaAlSiN3 phosphor was successfully prepared by high-temperature solid phase method using Ca2Si5N8:Eu as major raw materials. The phase transition and luminescence properties were studied in detail. It is found that the phase changes from Ca2Si5N8 to CaSiN2 when the temperature reaches 800 ℃. Then CaAlSiN3:Eu phosphor was synthesized by the solid phase reaction: (Ca,Eu)SiN2+AlN→(Ca,Eu)AlSiN3 when the reaches 1500 ℃. The morphology and luminescence properties of CaAlSiN3: Eu with different Eu concentration was also studied.
To deal with the shortcoming of the Tikhonov regularization in which the blurred image is extended with a zeros extension matrix. With careful analysis of the algorithms with Tikhonov regularization under zero boundary condition, a new extension matrix for the blurred image was proposed. The improved algorithm is in accord with the real image blurring process. Experimental results show that compared with other popular algorithms, the improved method performs favorably in solving the problem of the Average degradation and Gaussian degradation.
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