ORGANIC ELECTROLUMINESCENT ELEMENT AND LIGHTING DEVICE USING SAME

摘要

The present disclosure relates to an organic electroluminescence element including: a substrate 1 having a light transmissive property; a light diffusion layer 2 ; a light transmissive electrode 3 ; a light reflective electrode 4 ; and multiple light emitting layers E spaced from each other. With regard to the m-th light emitting layer Em being the m-th closest light emitting layer to the light reflective electrode 4 , relations defined by following expressions (2) and (3) are satisfied. In the following expressions, » m represents the weighted average emission wavelength, Æ m represents the phase shift, n m (» m ) represents the average refractive index of a medium filling a space between the light reflective electrode 4 and the m-th light emitting layer Em , and d m represents the distance from the light reflective electrode 4 to the m-th light emitting layer Em. l is an integer equal to or more than 0. [FORMULA 1] Æ » m × » m 4 �¢ À + l - 0.1 2 �¢ » m ‰¤ n m » m × d m ‰¤ Æ » m × » m 4 �¢ À + l + 0.6 2 �¢ » m n m » m × d m ‰¥ 0.6 �¢ » m