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Electrochemical deposition preparation method of high efficient light-emitting film

A light-emitting thin-film, high-efficiency technology

Inactive Publication Date: 2009-02-04
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main reason is that although the electrochemically polymerized film has good conductivity and charge transport properties, the molecular structure defects inside the film, electrolyte doping and rough surface morphology will restrict the application of electrochemically polymerized films in organic electroluminescence. Light-emitting layer of the device

Method used

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  • Electrochemical deposition preparation method of high efficient light-emitting film
  • Electrochemical deposition preparation method of high efficient light-emitting film
  • Electrochemical deposition preparation method of high efficient light-emitting film

Examples

Experimental program
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Effect test

Embodiment 1

[0106] Example 1: Electrochemical preparation of luminescent film

[0107] 1. Preparation of electrolyte

[0108] Dissolve the luminescent compound TCPC with electroactive groups (the synthesis of the luminescent compound is detailed in Chinese Patent: 200610016555.0) in the electrolyte solution, and the concentration of the luminescent compound is 1 mg / ml. The supporting electrolyte is tetrabutylammonium hexafluoroarsenate with a concentration of 0.1 mol / liter. The solvent is a mixed solution of acetonitrile and dichloromethane with a volume ratio of 3:2. The luminescent compound used in the present invention is slightly soluble in acetonitrile, and in order to increase the concentration of the compound, dichloromethane is added to increase the solubility of the luminescent compound.

[0109] 2. The use of electrodes

[0110] The working electrode is an ITO (indium tin oxide) electrode with an area of ​​1 to 2 square centimeters. The auxiliary electrode is a titanium plat...

Embodiment 2

[0123] Example 2: Application of high-efficiency electrochemical deposition of luminescent thin films in organic electroluminescent devices

[0124] 1. Preparation of single-layer electroluminescent devices

[0125] The electrodeposited film prepared by cyclic voltammetry was cleaned and then dried under vacuum for 1 hour at a temperature of 25°C. Obtain the dry film under vacuum conditions, vapor-deposit metal barium (50nm) and aluminum (200nm) as the cathode of the electroluminescent device, the thickness of the deposited luminescent film is about 150nm, and the thickness is measured by atomic force microscope.

[0126] Figure 9 The variation curves of voltage-brightness-current density (a) and voltage-current efficiency-energy efficiency (b) of this device are shown. This device starts to emit light from 7V, and the maximum brightness is 6896cd / m 2 , the maximum luminous efficiency is 2.284cd / A, the maximum energy efficiency is 0.512lm / W, and the luminous peak of the de...

Embodiment 3

[0135] Spectral tests before and after electrochemical polymerization: such as Figure 12 As shown, 1 is the absorption spectrum of the luminescent compound before electrochemical polymerization, and 2 is the absorption spectrum after electrochemical polymerization. It can be seen from the figure that the absorption peak of the electrochemically polymerized film trifluorene has no obvious change compared with the spin-coated film, indicating that in the electrochemical polymerization, the electrochemical process does not affect the main chain of light emission. After electrochemical polymerization, carbazole is polymerized to generate conjugated dimeric N-alkyl carbazole, which increases the delocalization of π electrons and red-shifts the absorption peak of the original carbazole. The absorption spectrum after electrochemical polymerization shows a broad absorption band from 600nm to 900nm, which is attributed to the absorption of dimeric carbazole cations, indicating that th...

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Abstract

The invention belongs to the field of organic light emission, in particular to an electro-chemical deposition preparation method of high-efficiency organic light emitting film, and an application of the light emitting film in preparing high-efficiency organic electroluminescent light emitting device. The light emitting film is prepared through an electro-chemical deposition method in an electrolytic cell in the following steps: electrolytic solution preparation, electro-chemical deposition, deposition film cleaning and drying and the like; the prepared light emitted film has the advantages of simple process, high light emission rate, small impact of electro-chemical doping on efficiency, easy control of area and size and adjustable light emission color. The light emitting film can be used as a light emission layer in the organic electroluminescent light emitting device, to prepare single-layer or multi-layer high-efficiency organic electroluminescent light emitting devices and obtain dark blue light emission devices; the lumen efficiency of the devices reaches 4.436cd / A which reaches or exceeds the efficiency level of most parts prepared through the traditional part processing technologies.

Description

technical field [0001] The invention belongs to the field of organic luminescence, and in particular relates to an electrochemical deposition preparation method of a high-efficiency organic luminescence film and the application of the luminescence film in preparing high-efficiency organic electroluminescence devices. Background technique [0002] Today, with the rapid development of optoelectronic technology, as an important field of optoelectronic technology - light-emitting display technology is also advancing at an astonishing speed. The successful development of organic electroluminescent devices (OLEDs), a new type of light-emitting technology that emerged at the end of the 20th century, has promoted the development of new industries such as full-color high-resolution ultra-thin displays, large-screen displays, and solid-state white lighting. Although electroluminescence from organic materials has been observed since the 1960s, it was not until 1987 that Kodak invented ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D9/02H01L51/56
Inventor 马於光顾成唐诗陆丹沈方中张明
Owner JILIN UNIV
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