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Abstract

A wavelength-converting element includes an alloying substrate, a wavelength-converting layer and a diffusion reflection layer. A material of the alloying substrate includes at least five major alloying elements and at least one minor alloying element. The at least five major alloying elements are selected from a group consisting of Ni, Ti, V, Cr, Mn, Fe, Co, Al, Cu, Ta, Nb, Zr, Mg and Pt group elements. An atomic percentage of each of the major alloying elements is between 5 at % and 35 at %. The alloying substrate has mixed entropy, which is greater than 3 J/K·mol. The wavelength-converting layer is disposed above the alloying substrate. The diffusion reflection layer is disposed between the alloying substrate and the wavelength-converting layer. The invention further provides a projection apparatus using the wavelength-converting element and a manufacturing method of the wavelength-converting element. The wavelength-converting element of the invention can improve mechanical properties, temperature resistance and reflectivity.

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First Claim