Perovskite light emitting device containing exciton buffer layer and method for manufacturing same

Patent metadata

Field	Value
Publication number	US-10263207-B2
Application number	US-201515524754-A
Country	US
Kind code	B2
Filing date	Nov 6, 2015
Priority date	Nov 6, 2014
Publication date	Apr 16, 2019
Grant date	Apr 16, 2019

Abstract

Provided are a perovskite light emitting device containing an exciton buffer layer, and a method for manufacturing the same. A light emitting device of the present invention comprises: an exciton buffer layer in which a first electrode, a conductive layer disposed on the first electrode and comprising a conductive material, and a surface buffer layer containing fluorine-based material having lower surface energy than the conductive material are sequentially deposited; a light-emitting layer disposed on the exciton buffer layer and containing an organic-inorganic hybrid perovskite light emitting body; and a second electrode disposed on the light-emitting layer. Accordingly, an organic-inorganic hybrid perovskite is formed with a combined FCC and BSS crystal structure in a nanoparticle light-emitting body; the present invention forms a lamellar structure in which an organic plane and an inorganic plane are alternatively deposited; and an exciton is bound by the inorganic plane, thereby being capable of expressing high color purity.

First claim

The invention claimed is:

1. A light emitting device comprising:
a first electrode;
an exciton buffer layer disposed on the first electrode and comprising a conductive material and a fluorine-based material having lower surface energy than the conductive material;
a light emitting layer disposed on the exciton buffer layer and comprising a perovskite material; and
a second electrode disposed on the light emitting layer.

2. The light emitting device of claim 1 , wherein the exciton buffer layer is configured so that a conductive layer comprising the conductive material and a surface buffer layer comprising the fluorine-based material having lower surface energy than the conductive material are sequentially deposited.

3. The light emitting device of claim 2 , wherein the surface buffer layer has a thickness of 3 nm or more.

4. The light emitting device of claim 1 , wherein the exciton buffer layer has a conductivity of 10 −7 S/cm to 1,000 S/cm.

5. The light emitting device of claim 1 , wherein the fluorine-based material has a surface energy of 30 mN/m or less.

6. The light emitting device of claim 1 , wherein a concentration of the fluorine-based material in a second surface of the surface buffer layer opposite to a first surface, which is closer to the conductive layer, is higher than a concentration of the fluorine-based material in the first surface of the surface buffer layer.

7. The light emitting device of claim 6 , wherein a work function determined for the second surface of the conductive layer is greater than or equal to 5.0 eV.

8. The light emitting device of claim 1 , wherein the fluorine-based material is an ionomer comprising at least one F element.

9. The light emitting device of claim 8 , wherein the ionomer is a fluorinated ionomer.

10. The light emitting device of claim 1 , wherein the fluorine-based material comprises at least one ionomer selected from the group consisting of ionomers having structures represented by the following Formulas 1 to 12:

wherein m is a number ranging from 1 to 10,000,000, x and y are each independently a number ranging from 0 to 10, and M + represents Na + , K + , Li + , H + , CH 3 (CH 2 )—NH 3 + (where n is an integer ranging from 0 to 50), NH 4 + , NH 2 + , NHSO 2 CF 3 + , CHO + , C 2 H 5 OH + , CH 3 OH + , or RCHO + (where R represents CH 3 (CH 2 ) n —, where n is an integer ranging from 0 to 50);

wherein m is a number ranging from 1 to 10,000,000;

wherein m and n are 0<m≤10,000,000 and 0≤n<10,000,000, x and y are each independently a number ranging from 0 to 20, and M + represents Na + , K + , Li + , H + , CH 3 (CH 2 )—NH 3 + (where n is an integer ranging from 0 to 50), NH 4 + , NH 2 + , NHSO 2 CF 3 + , CHO + , C 2 H 5 OH + , CH 3 OH + , or RCHO + (where R represents CH 3 (CH 2 ) n —, where n is an integer ranging from 0 to 50);

wherein m and n are 0<m≤10,000,000 and 0≤n<10,000,000, x and y are each independently a number ranging from 0 to 20, M + represents Na + , K + , Li + , H + , CH 3 (CH 2 )—NH 3 + (where n is an integer ranging from 0 to 50), NH 4 + , NH 2 + , NHSO 2 CF 3 + , CHO + , C 2 H 5 OH + , CH 3 OH + , or RCHO + (where R represents CH 3 (CH 2 ) n —, where n is an integer ranging from 0 to 50);

wherein m and n are 0<m≤10,000,000 and 0≤n<10,000,000, z is a number ranging from 0 to 20, and M + represents Na + , K + , Li + , H + , CH 3 (CH 2 )—NH 3 + (where n is an integer ranging from 0 to 50), NH 4 + , NH 2 + , NHSO 2 CF 3 + , CHO + , C 2 H 5 OH + , CH 3 OH + , or RCHO + (where R represents CH 3 (CH 2 ) n —, where n is an integer ranging from 0 to 50);

wherein m and n are 0<m≤10,000,000 and 0≤n<10,000,000, x and y are each independently a number ranging from 0 to 20, Y represents one selected from —COO − M + , —SO 3 − NHSO 2 CF 3 + , and —PO 3 2− (M + ) 2 , and M + represents Na + , K + , Li + , H + , CH 3 (CH 2 )—NH 3 + (where n is an integer ranging from 0 to 50), NH 4 + , NH 2 + , NHSO 2 CF 3 + , CHO + , C 2 H 5 OH + , CH 3 OH + , and RCHO + (R represents CH 3 (CH 2 ) n —, where n is an integer ranging from 0 to 50);

wherein m and n are 0<m≤10,000,000 and 0≤n<10,000,000, and M + represents Na + , K + , Li + , H + , CH 3 (CH 2 ) n NH 3 + (where n is an integer ranging from 0 to 50), NH 4 + , NH 2 + , NHSO 2 CF 3 + , CHO + , C 2 H 5 OH + , CH 3 OH + , or RCHO + (where R represents CH 3 (CH 2 ) n −, where n is an integer ranging from 0 to 50);

wherein m and n are 0<m≤10,000,000 and 0≤n<10,000,000;

wherein m and n are 0<m≤10,000,000 and 0≤n<10,000,000, x is a number ranging from 0 to 20, and M + represents Na + , K + , Li + , H + , CH 3 (CH 2 )—NH 3 + (where n is an integer ranging from 0 to 50), NH 4 + , NH 2 + , NHSO 2 CF 3 + , CHO + , C 2 H 5 OH + , CH 3 OH + , or RCHO + (where R represents CH 3 (CH 2 ) n —, where n is an integer ranging from 0 to 50);

wherein m and n are 0<m≤10,000,000 and 0≤n<10,000,000, x and y are each independently a number ranging from 0 to 20, and M + represents Na + , K + , Li + , H + , CH 3 (CH 2 )—NH 3 + (where n is an integer ranging from 0 to 50), NH 4 + , NH 2 + , NHSO 2 CF 3 + , CHO + , C 2 H 5 OH + , CH 3 OH + , or RCHO + (where R represents CH 3 (CH 2 ) n —, where n is an integer ranging from 0 to 50);

wherein m and n are 0<m≤10,000,000 and 0≤n<10,000,000, R f ═—(CF 2 ) z — (where z is an integer ranging from 1 to 50, provided that 2 is excluded), —(CF 2 CF 2 O) z CF 2 CF 2 — (where z is an integer ranging from 1 to 50), —(CF 2 CF 2 CF 2 O) z CF 2 CF 2 — (where z is an integer ranging from 1 to 50), and M + represents Na + , K + , Li + , H + , CH 3 (CH 2 ) n NH 3 + (where n is an integer ranging from 0 to 50), NH 4 + , NH 2 + , NHSO 2 CF 3 + , CHO + , C 2 H 5 OH + , CH 3 OH + , or RCHO + (where R represents CH 3 (CH 2 ) n —, where n is an integer ranging from 0 to 50); and

wherein m and n are 0≤m<10,000,000 and 0<n≤10,000,000, x and y are each independently a number ranging from 0 to 20, Y represents one selected from —SO 3 − M + , —COO − M + , —SO 3 − NHSO 2 CF 3 + , and —PO 3 2− (M + ) 2 , and M + represents Na + , K + , Li + , H + , CH 3 (CH 2 )—NH 3 + (where n is an integer ranging from 0 to 50), NH 4 + , NH 2 + , NHSO 2 CF 3 + , CHO + , C 2 H 5 OH + , CH 3 OH + , or RCHO + (where R represents CH 3 (CH 2 ) n —, where n is an integer ranging from 0 to 50).

11

Assignees

• Postech Acad Ind Found

Inventors

• Lee Taewoo
• Im Sanghyuk
• Cho Himchan
• Kim Younghoon

Classifications

• H01B1/127

  comprising five-membered aromatic rings in the main chain, e.g. polypyrroles, polythiophenes · CPC title

• H01B1/125

  comprising aliphatic main chains, e.g. polyactylenes · CPC title

• Y02E10/549

  Organic PV cells · CPC title

• C09K2211/188

  of other metals not provided for in one of the previous groups · CPC title

• C09K11/06

  containing organic luminescent materials · CPC title