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Method for preparing organic light emitting film by electrochemical deposition and application in light emitting device

A technology for electroluminescent devices and luminescent thin films, which is applied in chemical instruments and methods, electrical solid devices, electrolytic organic material coatings, etc., and can solve the problems of no report on the luminous efficiency of thin films and no further preparation of electroluminescent devices.

Inactive Publication Date: 2009-02-18
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the luminous efficiency of the thin film was not reported, and no further electroluminescent devices were prepared.

Method used

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  • Method for preparing organic light emitting film by electrochemical deposition and application in light emitting device
  • Method for preparing organic light emitting film by electrochemical deposition and application in light emitting device
  • Method for preparing organic light emitting film by electrochemical deposition and application in light emitting device

Examples

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Effect test

Embodiment 1

[0120] Example 1: Synthesis of Light-Emitting Compounds with Charged Active Units

[0121] We only illustrate this patent by taking the synthesis of the compound with the following structure as an example, rather than limiting this patent. The idea or route of synthesis of light-emitting compounds, or the formation of compounds listed in formula (1) above, and the preparation of light-emitting thin films by electrochemical deposition methods are all within the scope of design ideas of this patent.

[0122]

[0123] synthetic route

[0124]

[0125] 1. Synthesis of 2,7-dibromofluorene

[0126] 6g (36mmol) of fluorene, 92mg (1.6mmol) of ferric chloride, and 4ml of liquid bromine were reacted in dichloromethane solvent for 12 hours in the dark. The resulting solid was filtered and recrystallized from ethanol to obtain a white solid product with a yield of 75%. 1 H NMR (500 MHz, CDCl 3 ): δ7.66(s, 2H, Ar-H), δ7.60-7.59(d, 2H, Ar-H), δ7.51-7.49(d, 2H, Ar-H), δ3.87(s , 2H...

Embodiment 2

[0141] Example 2: Electrochemical preparation of luminescent film

[0142] 1. Preparation of electrolyte

[0143] The synthesized luminescent molecules linked with electroactive groups were dissolved in the electrolyte solution, and the compound concentration was 1 mg / ml. The supporting electrolyte is tetrabutylammonium hexafluorophosphate, the concentration is 0.1 mol / liter. The solvent is a mixed solution of acetonitrile and dichloromethane with a volume ratio of 2:1. The solute compound prepared 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 compound.

[0144] 2. The use of electrodes

[0145] The working electrode is an ITO (indium tin oxide) electrode with an area of ​​1 square centimeter to 2 square centimeters. The auxiliary electrode is a platinum wire with a diameter of 1 mm. The reference electrode is silver / silver ions (the solut...

Embodiment 3

[0158] In order to compare with devices made by spin-coating technology, we can also form uniform and flat films through spin-coating processing, so we use a preparation method similar to polymer devices to prepare a structure that is ITO / PEDOT:PSS / TCPC (5mg / ml ) / Ba / Al electroluminescent devices, PEDOT:PSS (polyethylenedioxythiophene / polystyrenesulfonic acid) can enhance hole injection and improve ITO electrodes.

[0159] Fig. 8 shows the variation curves of voltage-brightness-current density (a) and voltage-current efficiency-energy efficiency (b) of a single-layer device prepared by a spin-coating method. This device starts to emit light from 4.5V, with a maximum brightness of 79cd / m 2 , the maximum luminous efficiency is 0.15cd / A, the maximum energy efficiency is 0.078lm / w, and it emits blue light.

[0160] Through the comparison of device performance before and after electrochemical polymerization, we found that although the turn-on voltage of the device prepared after el...

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Abstract

Present invention relates to an organic light-emitting film electrochemical deposition preparation method and application in preparing electroluminescence device, belonging to organic luminescence field. Said Light-emitting film is formed by electrochemical deposition in electrolytic bath, the monomer for electrochemical polymerization formed by chemical bond connecting electricity activity unit and luminescence unit, wherein electricity activity unit consisting of carbazole, thiophene, pyrrole, ethene, ethyne or phenylamine, diphenylamine, and triphenylamine, luminescence unit being cinnamic dimer, tripolymer, tetramer or terphenyl, quaterphenyl, quinquephenyl, tetracene, pentacene, fluorene dimer, tripolymer or tetramer and terpyridyl (dipyridyl ) rhenium etc, prepared electroluminescence device having simple technology, high device luminous efficiency, easy control area adjustable luminous color etc advantages.

Description

technical field [0001] The invention belongs to the field of organic luminescence, and in particular relates to a method for preparing an organic luminescence thin film by electrochemical deposition and the application of the organic luminescence thin film prepared by the method in an electroluminescent device. Background technique [0002] Organic / polymer electroluminescent devices have been developed by leaps and bounds in the past ten years. The new light-emitting technology that appeared at the end of the 20th century, the successful development of organic electroluminescent devices (OLED) and gallium nitride blue LEDs, formed new industries such as full-color high-resolution ultra-thin displays, large-screen displays, and solid-state white lighting. Due to the own advantages of organic / polymer LED (OLED / PLED) and its wider application than liquid crystal display (LCD), many scholars predict that OLED / PLED display will become a new generation of information display upgra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/56H01L51/54C25D9/02C09K11/06
Inventor 马於光李茂唐诗陆丹刘美容沈方中路平
Owner JILIN UNIV
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