A stress, its manufacturing method, and a composite material using a level sensor

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PROBLEM TO BE SOLVED : To provide a stress-induced light emitter which has an improved stress-induced light intensity in spite of containing a reduced amount of a rare earth metal and to provide a production method thereof. SOLUTION : The stress-induced light emitter is a stress-induced light emitter containing a matrix material which emits light upon receiving stress and contains a transition metal (except a rare earth metal) and further contains at least either element of Si and Sn, wherein at least part of the element is mixed with the matrix material in a state not solid-dissolved therein. COPYRIGHT : (C)2010, JPO&INPIT