| 摘要 |
Disclosed herein is a light-emitting element, including: a cathode; an anode; and a light-emitting unit, in which the light-emitting unit includes a first light-emitting layer, a second light-emitting layer, and a third light-emitting layer, which are laminated from the anode side to the cathode side, in which each of the first, second, and third light-emitting layers is configured to contain a luminescent material, a host material, and an assist dopant material, and in which, when the contents of the assist dopant materials contained in the first, second, and third light-emitting layers are respectively expressed by CAssist(EML1), CAssist(EML2) and CAssist(EML3), the following Relational Expression (A) is satisfied:
CAssist(EML1)≧CAssist(EML2)>CAssist(EML3)≧0 (A). |
| 主权项 |
1. A light-emitting element, comprising:
a cathode; an anode; and a light-emitting unit provided between the cathode and the anode to emit light when a driving voltage is applied, wherein the light-emitting unit includes a first light-emitting layer emitting first light, a second light-emitting layer emitting second light having a different color from the first light, and a third light-emitting layer emitting third light having the same color as the second light, which are laminated from the anode side to the cathode side, wherein each of the first, second, and third light-emitting layers is configured to contain a luminescent material, a host material supporting the luminescent material, and an assist dopant material, wherein the host material is a material having high electron transportability, and the assist dopant material is a material having high hole transportability, wherein, when the contents of the assist dopant materials contained in the first, second, and third light-emitting layers are respectively expressed by CAssist(EML1), CAssist(EML2), and CAssist(EML3), the following Relational Expression (A) is satisfied:
CAssist(EML1)≧CAssist(EML2)>CAssist(EML3)≧0 (A); and wherein, in each of the first, second, and third light-emitting layers, when mobility of holes is expressed by μh and mobility of electrons is expressed by μe, in the first light-emitting layer and the second light-emitting layer, the following Relational Expression (1) is satisfied:
0.01≦μe/μh≦100 (1). |
