Light-emitting device comprising light-emitting elements having different optical path lengths

A light-emitting device comprising:

• a first light-emitting element including a first reflective electrode, a first transparent conductive layer being in contact with the first reflective electrode, an EL layer being in contact with the first transparent conductive layer, and a semi-transmissive and semi-reflective electrode being in contact with the EL layer;
• a second light-emitting element including a second reflective electrode, a second transparent conductive layer being in contact with the second reflective electrode, the EL layer being in contact with the second transparent conductive layer, and the semi-transmissive and semi-reflective electrode being in contact with the EL layer;
• and
• a third light-emitting element including a third reflective electrode, the EL layer being in contact with the third reflective electrode, and the semi-transmissive and semi-reflective electrode being in contact with the EL layer,
• wherein the EL layer includes a first light-emitting layer emitting light with a wavelength λY and a second light-emitting layer emitting light with a wavelength λB,
• wherein, in the first light-emitting element, an optical path length from the first reflective electrode to the first light-emitting layer is 3λG/4 and an optical path length from the first reflective electrode to the semi-transmissive and semi-reflective electrode is λG,
• wherein, in the second light-emitting element, an optical path length from the second reflective electrode to the second light-emitting layer is 3λB/4 and an optical path length from the second reflective electrode to the semi-transmissive and semi-reflective electrode is λB, and
• wherein, in the third light-emitting element, an optical path length from the third reflective electrode to the first light-emitting layer is λR/4 and an optical path length from the third reflective electrode to the semi-transmissive and semi-reflective electrode is λR/2, where a wavelength relation of λR>λY>λG>λB is satisfied.

A light-emitting device comprising:

• a first light-emitting element including a first reflective electrode, a first transparent conductive layer being in contact with the first reflective electrode, an EL layer being in contact with the first transparent conductive layer, and a semi-transmissive and semi-reflective electrode being in contact with the EL layer;
• and
• a second light-emitting element including a second reflective electrode, the EL layer being in contact with the second reflective electrode, and the semi-transmissive and semi-reflective electrode being in contact with the EL layer,
• wherein the EL layer includes a first light-emitting layer emitting light with a wavelength λY and a second light-emitting layer emitting light with a wavelength λB,
• wherein, in the first light-emitting element, an optical path length from the first reflective electrode to the first light-emitting layer is 3λG/4 and an optical path length from the first reflective electrode to the semi-transmissive and semi-reflective electrode is λG, and
• wherein, in the second light-emitting element, an optical path length from the second reflective electrode to the second light-emitting layer is λR/4 and an optical path length from the second reflective electrode to the semi-transmissive and semi-reflective electrode is λR/2, where a wavelength relation of λR>λY>λG>λB is satisfied.