Patent ID: 9722198
Date: 2017-08-01
CPC Classifications: B82Y,C09K,H01L

Claim:
1. A light-emitting device comprising: a hole transport layer; an electron transport layer; and a light-emitting layer interposed between the hole transport layer and the electron transport layer, the light-emitting layer emitting light when an electric current is injected into the light-emitting layer, wherein the light-emitting layer has a stacked structure including: a first light-emitting layer composed of a first quantum dot having a first core part, and a first shell part coating the first core part, the first shell part having a first surface coated with a first surfactant that has a hole transport property and a second surfactant that has an electron transport property, the first shell part having a thickness of 3 to 5 monolayers based on a constituent molecule of the first shell part; and a second light-emitting layer composed of a second quantum dot having a second core part, and a second shell part, the second shell part having a thickness of less than 3 monolayers based on a constituent molecule of the second shell part, and the second shell part having a second surface coated with both the first surfactant having a hole transport property and the second surfactant having an electron transport property, and the first light-emitting layer is disposed proximal to the electron transport layer relative to the second light-emitting layer, and the second light-emitting layer is disposed proximal to the hole transport layer relative to the first light-emitting layer.