LIGHT-EMITTING ELEMENT, IMAGE FORMING APPARATUS, IMAGE DISPLAY APPARATUS AND IMAGE READING APPARATUS

摘要

A light-emitting element having a light-emitting section and a light-receiving section provided on a substrate. The light-emitting section includes: an organic compound in which light is emitted; a translucent reflecting portion that transmits the emitted light which has spectral radiance changeable with changes in ambient temperature; and a transparent portion that radiates first part of the light coming through the translucent reflecting portion to outside and total-reflects second part that is light incident to a boundary surface therebetween at angles larger than a critical angle. Wherein, the light-receiving section is capable of receiving the light total-reflected at the boundary surface, the received light having a quantity of light changeable with changes in wavelength of the light passing through the translucent reflecting portion. The light-receiving section further outputs a signal which has an amplitude level in correlation to the quantity of light.

主权项

1. A light-emitting element comprising:
a light-emitting section and a light-receiving section provided on a substrate, wherein the light-emitting section includes: an anode and a cathode; an organic compound provided between the anode and the cathode, wherein holes injected from the anode and electrons injected from the cathode couple with each other, thereby emitting light; a translucent reflecting portion provided on the anode and making an optical resonance structure with the cathode, the translucent reflecting portion being configured to transmit the light emitted in the organic compound, the light having spectral radiance changeable with changes in ambient temperature; and a transparent portion provided on the translucent reflecting portion and configured to radiate first part of the light coming through the translucent reflecting portion to outside and to total-reflect second part of the light coming through the translucent reflecting portion, the second part of the light being light incident to a boundary surface between the transparent portion and outside at angles larger than a critical angle; and wherein the light-receiving section is arranged to be capable of receiving the light total-reflected at the boundary surface and is configured to output a signal, the light received by the light-receiving section having a quantity of light changeable with changes in wavelength of the light passing through the translucent reflecting portion, and the signal having an amplitude level in correlation to the quantity of light.