Composite film and fabrication method thereof, photoelectric element and photoelectric apparatus

Patent metadata

Field	Value
Publication number	US-9828544-B2
Application number	US-201414426811-A
Country	US
Kind code	B2
Filing date	Jul 25, 2014
Priority date	Oct 21, 2013
Publication date	Nov 28, 2017
Grant date	Nov 28, 2017

Abstract

Embodiments of the invention relate to a composite film and a fabrication method thereof, a photoelectric element and a photoelectric apparatus. The fabrication method of the composite film includes: preparing a polyfluorene-based compound solution, wherein the polyfluorene-based compound solution includes polyfluorene or polyfluorene derivatives; preparing a quantum dot solution; mixing the polyfluorene-based compound solution and the quantum dot solution together to prepare a mixed solution; removing a solvent in the mixed solution to prepare the composite film.

First claim

What is claimed is:

1. A fabrication method of a composite film which can emit white light, comprising:
preparing a polyfluorene-based compound solution, wherein the polyfluorene-based compound solution includes polyfluorene or polyfluorene derivatives which can emit blue light;
preparing a quantum dot solution from quantum dots which can emit red or green light;
mixing the polyfluorene-based compound solution and the quantum dot solution together to prepare a mixed solution; and
removing a solvent in the mixed solution to prepare the composite film,
wherein the solvent in the polyfluorene-based compound solution is methylbenzene, and the solvent in the quantum dot solution is methylbenzene.

2. The fabrication method according to claim 1 , wherein, the polyfluorene derivatives include one or more materials selected from the group consisting of poly (9,9-dialkyl fluorene), copolymer of bis-hexyl fluorene and anthracene, biphenyl with dendrite-containing side chains, tetra-alkyl-substituted indenofluorene polymer, aryl-substituted indenofluorene polymer, polyfluorene-bithiophene alternate copolymer, as well as, fluorene and thiophene, ethylene dioxythiophene, 4,7-dithiophene-2,1,3-benzothiadiazole, binary or ternary random copolymers of 4,7-dithiophene-2,1,3-benzoselenadiazole.

3. The fabrication method according to claim 1 , wherein the quantum dots include Group II-Vl element compounds or Group lll-V element compounds.

4. The fabrication method according to claim 1 , wherein a concentration of the polyfluorene-based compound solution is 3 wt %-25 wt %; and a concentration of the quantum dot solution is 4 mg/ml-30 mg/ml; and
in the mixed solution, the polyfluorene-based compound solution accounts for 50 wt %-90 wt %, and the quantum dot solution accounts for 10 wt %-50 wt %.

5. The fabrication method according to claim 1 , wherein the removing a solvent in the mixed solution to prepare the composite film includes:
removing the solvent to prepare the composite film, after preparing the mixed solution into a film by a method of spin coating, inkjet printing or printing.

Assignees

• Boe Technology Group Co Ltd

Inventors

• Gu Jingxia
• Tang Chen

Classifications

• C08K2003/3036

  of zinc · CPC title

• C08G2261/5222

  electrofluorescent · CPC title

• C09K2211/1416

  Condensed systems · CPC title

• C08G2261/1412

  Saturated aliphatic units · CPC title

• C09K11/06

  containing organic luminescent materials · CPC title