| 摘要 |
Blue organic EL elements, which have a shorter lifetime and lower luminance characteristics than green and red ones, have had a problem: particularly when blue elements are used in a light-emitting device capable of modulating light emission colors, light significantly attenuates and characteristics further deteriorates. A dielectric mirror which is selective in wavelength is provided between organic EL elements, and the number of times especially blue light emission from an organic EL element is transmitted through an electrode having a light-transmitting property is reduced as much as possible, so that attenuation of light is suppressed. Thus, a light-emitting device capable of modulation of light emission colors which has a high luminance and a long lifetime can be provided. In the light-emitting device, voltages applied to the organic EL elements, which deteriorate individually, are separately controlled, whereby the color tone can be kept constant for a long period.
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