Light-emitting device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorsKazuki KAJIYAMA, Naoaki HASHIMOTO, Sachiko KAWAKAMI, Tsunenori SUZUKI, Yuki HAYASHI, Satoshi SEO
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Abstract
A light-emitting device having favorable characteristics. The light-emitting device includes at least a light-emitting layer and a hole-transport layer between a pair of electrodes. The hole-transport layer is provided in contact with the light-emitting layer. The light-emitting layer contains a first compound serving as a host material and a second compound serving as a guest material. The hole-transport layer contains a third compound. A HOMO level of the second compound is higher than a HOMO level of the first compound. Each of the first compound and the third compound includes deuterium.
Claims19
A light-emitting device comprising a light-emitting layer and a hole-transport layer between a pair of electrodes,
- wherein the light-emitting layer comprises a first compound as a host material and a second compound as a guest material,
- wherein the hole-transport layer comprises a third compound,
- wherein a HOMO level of the second compound is higher than a HOMO level of the first compound, and
- wherein each of the first compound and the third compound comprises deuterium.
A light-emitting device comprising a light-emitting layer and a hole-transport layer between a pair of electrodes,
- wherein the hole-transport layer is provided in contact with the light-emitting layer,
- wherein the light-emitting layer comprises a first compound as a host material and a second compound as a guest material,
- wherein the hole-transport layer comprises a third compound,
- wherein the first compound consists of carbon and hydrogen, and
- wherein each of the first compound and the third compound comprises deuterium.
Dependencies are inferred from the claim text.