Patent ID: 9595625
Date: 2017-03-14
CPC Classifications: B82Y,C01B,C01P,C09K,H01L,H05B

Claim:
1. A light-emitting device comprising: a hole transport layer; an electron transport layer; a first light-emitting layer interposed between the hole transport layer and the electron transport layer, the first light-emitting layer comprising first quantum dots, the first light-emitting layer being constructed to emit light when an electric current is injected into the first light-emitting layer, wherein the first quantum dots are a nanoparticle material comprising a first core part and a first shell part coating the first core part, the first shell part having a thickness of 3 to 5 monolayers of a constituent molecule of the first shell part; and a second light-emitting layer, the second light-emitting layer comprising second quantum dots, the second light-emitting layer being constructed to emit light when the electric current is injected into the second light-emitting layer, wherein the second quantum dots are a nanoparticle material comprising a second core part and a second shell part coating the second core part, the second shell part having a thickness of less than 3 monolayers based on a constituent molecule of the second shell part, the first light-emitting layer being disposed proximal to the electron transport layer relative to the second light-emitting layer, and the second light-emitting layer being disposed proximal to the hole transport layer relative to the first light-emitting layer, and the first shell part has a greater thickness than the second shell part.