Perovskite light emitting device
AssigneesLG Display Co., Ltd., Korea University Research and Business Foundation, Unist (Ulsan National Institute of Science and Technology)
InventorsHan Young Woo, Kiseok Chang, Myoung Hoon Song, Jeong Min Moon, Su Seok Choi, Thanh Luan Nguyen, Seungjin Lee, Chung Hyeon Jang
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Abstract
A perovskite light emitting diode having degradation of the characteristics of the light emitting device, caused by PEDOT:PSS can be improved by replacing PEDOT:PSS contained in a conventional hole transport layer with an anionic conjugated polymer having ammonium-based counter ions, and the light emission characteristics can be greatly improved by passivating defects of a perovskite light emitting layer with a hole transport layer containing a conjugated polymer and increasing crystal growth.
Claims6
A perovskite light-emitting device comprising:
- a first electrode;
- a hole transport layer disposed on the first electrode;
- a perovskite light-emitting layer disposed on the hole transport layer;
- an electron transport layer disposed on the perovskite light-emitting layer;
- and
- a second electrode disposed on the electron transport layer;
- wherein the hole transport layer contains a compound represented by a following Chemical Formula 1,
- wherein a HOMO level of the hole transport layer is in a range of 5.60 to 6.0 eV,
- wherein a difference between a LUMO level of the hole transport layer and a LUMO level of the perovskite light-emitting layer is 0.3 eV or greater, and
- wherein a difference between a HOMO level of the hole transport layer and a HOMO level of the perovskite light-emitting layer is 0.26 eV or lower:
- wherein m is an integer between 1 and 1,000,000:
- wherein each of R1 and R2 is independently -Ar3-(O—CnH2n—X−Y+)p;
- n being is an integer between 1 and 20, and p is an integer between 1 and 3,
- wherein Ar3 is phenylene,
- wherein X− is SO3−, and Y+ is NR3R4R5R6+,
- wherein each of R3 to R6 is independently selected from an alkyl group having 1 to 20 carbon atoms,
- wherein Ar2 is a substituted or unsubstituted arylene.
Dependencies are inferred from the claim text.