| 摘要 |
To improve either stability of emission characteristics with respect to time or with respect to inter-device fluctuation. On this purpose, in a light emitting device comprising the first luminescent material, and the second luminescent material absorbing light from said first luminescent material and emitting light, the phosphor included in said second luminescent material is used, the absorption spectrum of which satisfies the formula (1) below. <?in-line-formulae description="In-line Formulae" end="lead"?>1>=P(lambda)<SUB>min</SUB>/P(lambda)<SUB>max</SUB>>=0.3 (I)<?in-line-formulae description="In-line Formulae" end="tail"?> (In the formula (I) above, P(lambda) indicates the intensity of the absorption spectrum at the wavelength a, P(lambda)<SUB>max </SUB>indicates the maximum value of P(lambda) in the range of 400 nm<=lambda<=450 nm, and P(lambda)min indicates the minimum value of P(lambda) in the range of 400 nm<=lambda<=450 nm.)
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