The present invention relates to light emitting device materials and to a light emitting device which can convert electrical energy into {TAIL ~ light} and can be used for display elements, flat panel displays, back lights, lighting, interiors, signs, signboards, electronic cameras, {HEAD ~ light signal generators} and the like 
The present invention relates to light emitting device materials and to a light emitting device which can convert electrical energy into { TAIL ~ light } and can be used for display elements , flat panel displays , back lights , lighting , interiors , signs , signboards , electronic cameras , { HEAD ~ light signal generators } and the like
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