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Red and green light emitting conjugated polymer and preparation method as well as application thereof

A conjugated polymer, red and green light technology, applied in chemical instruments and methods, luminescent materials, gas discharge lamps, etc., can solve the problems of polymer molecular chain aggregation, unstable emission spectrum, etc., and achieve stable film morphology , The effect of simple material synthesis and preparation

Inactive Publication Date: 2009-06-03
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The film formed by this blending method is prone to the aggregation of polymer molecular chains and the instability of the emission spectrum.

Method used

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  • Red and green light emitting conjugated polymer and preparation method as well as application thereof
  • Red and green light emitting conjugated polymer and preparation method as well as application thereof
  • Red and green light emitting conjugated polymer and preparation method as well as application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Example 1 Preparation of 2,7-dibromofluorene.

[0023] Prepare 2,7-dibromofluorene according to the method disclosed in World Patent WO 99 05184 in 1997 and the method disclosed in "Chem.Mater" (Chem. Powder (80 mg, 1.43 mmol) was poured into a three-necked flask, 100 ml of chloroform was added, cooled in an ice-water bath, a mixed solution of bromine (31.4 g, 0.196 mol) and 35 ml of chloroform was added dropwise from a constant pressure funnel, The temperature in the bottle should not exceed 5°C during the dropwise addition. After the reaction is completed, filter and recrystallize with chloroform to obtain white crystals. 13 C NMR and GC-MASS tests showed that it was the target product 2,7-dibromofluorene.

Embodiment 2

[0025] Preparation of 2,7-dibromo-9,9-dialkylfluorene

[0026] Take the preparation of 2,7-dibromo-9,9-di-n-octylfluorene as an example to illustrate. 2,7-dibromo-9,9-di-n-octylfluorene was prepared according to the method disclosed in World Patent WO9905184 in 1997 and the method disclosed in "Chem. Mater" (Chem. Mater) 11 (1997) 11083. Get 2,7-dibromofluorene (15.0 g, 0.046 mol) obtained in Example 1, and pour benzyltriethylammonium chloride (0.09 g, 0.39 mmol) into a three-necked flask, and add 150 ml of dimethyl sulfoxide , 45 milliliters of NaOH aqueous solution with a weight ratio of 50%, was stirred vigorously at room temperature to form a suspension, 1-bromo-n-octyl alkane (18.6 g, 0.097 mmol) was added dropwise, stirred continuously for 3 hours, then extracted with diethyl ether, and diethyl ether was combined phase, washed with saturated aqueous NaCl, anhydrous MgSO 4 dry. Recrystallization from acetone gave white crystals after removal of the solvent. 13 C NMR a...

Embodiment 3

[0029] Preparation of 2,7-bis(4,4,5,5-tetramethyl-1,3,2-dioxaborolane-diyl)-9,9-dialkylfluorene

[0030] The preparation of 2,7-bis(4,4,5,5-tetramethyl-1,3,2-dioxaborolane-diyl)-9,9-di-n-octylfluorene is taken as an example for illustration. 2,7-bis(4,4,5,5-tetramethyl-1,3,2-dioxaborolane-diyl) was prepared according to the method disclosed in "Macromolecules" 30 (1997) 7686 -9,9-Di-n-octylfluorene. The dried 2,7-dibromo-9,9-dioctylfluorene (10.96 g) obtained in Example 2 was dissolved in 180 ml of tetrahydrofuran (THF), and 1.6 mol / liter of n-butyl was added dropwise at -78°C Lithium 28 ml, reacted under nitrogen atmosphere for 2 hours, then quickly added 2-isopropyl-4,4,5,5-tetramethyl-1,3,2-dioxaborane 25 ml, reacted at low temperature After 2 hours, slowly rise to room temperature and react for 24 hours. The reaction mixture was poured into water and extracted with ether. The organic layer was washed with brine and washed with anhydrous MgSO 4 dry. After removing the...

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Abstract

The invention discloses a red and green light emitting conjugated polymer. The conjugated polymer is a single-chain fluorene-based random copolymer composed of three unary compounds. The three unary compounds are 9,9-dialkyl fluorine, 2,1,3-benzthiadiazole and 4,7-bis(2'-thienyl)-2,1,3-benzthiadiazole, and the mol ratio thereof is 1-x-y:x:y, wherein, x is not less than 0.05 but not more than 0.45, and y is not less than 0.00001 but not more than 0.0005. In the conjugated polymer, light emitting units of different colors are copolymerized on a single molecular chain by covalent bonds to produce single chain multi-spectral emission. The conjugated polymer is characterized by simple synthesis and preparation and stable thin film morphology, thus achieving emission of white light with stable spectrum, which is of great significance to the application in the fields of back light sources and lighting.

Description

technical field [0001] The invention relates to a red-green light-emitting conjugated polymer, a preparation method thereof and an application in an indium gallium nitrogen (InGaN)-based white light LED. Background technique [0002] In recent years, with the development of nitride-based high-brightness blue / violet LED applications, nitride white light-emitting diodes (LEDs) have become the focus of attention, and white LEDs will become the third largest after incandescent lamps and fluorescent lamps. Generation lighting source. At present, there are two schemes widely used to realize nitride white LEDs: (1) InGaN-based blue or violet LEDs are used as the basic light source, and wavelength conversion is realized through phosphor powder; (2) multi-chip color-mixed white LEDs. Since the latter emits all the light from the light-emitting diodes, the production cost is relatively high, and in addition, due to the difference in aging characteristics among the three color light-e...

Claims

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Application Information

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IPC IPC(8): C08G61/02C09K11/06H01L51/54
CPCY02B20/181Y02B20/00
Inventor 章勇候琼郑树文李述体范广涵
Owner SOUTH CHINA NORMAL UNIVERSITY
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