The present invention provides an electrochromic polyamic acid material, a preparation method thereof and a display device, wherein the molecular structure of the electrochromic polyamic acid material includes oligoaniline and carbazolyl triphenylamine. The oligoaniline serves as an electrochemically sensitive group, and the carbazolyl triphenylamine serves as a fluorescence emitting group. The electrochromic polyamic acid material is an electrically controlled fluorescent polymer. Fluorescence intensity of the electrochromic polyamic acid material undergoes reversible fluorescence conversion with a change of an applied voltage, due to a redox reaction of the oligoaniline at different voltages, resulting in an interchange between a benzene ring and an anthracene ring in a molecular structure, and an electron/energy transfer path with the fluorescence emitting group are generated or eliminated, thereby realizing the electrically controlled fluorescent properties of the electrochromic polyamic acid material.

Provided are a polymer semiconductor including a first structural unit represented by Chemical Formula 1 and a second structural unit represented by Chemical Formula 2, a stretchable polymer thin film including the same, and an electronic device.

##STR00001##

Definitions of Chemical Formulas 1 and 2 are as described in the detailed description.

This hole collection layer composition for an organic photoelectric conversion elements comprises: a charge-transporting substance formed of a polyaniline derivative represented by formula (1); fluorochemical surfactant; metal oxide nanoparticles; and a solvent. The hole collection layer composition provides a thin film having excellent adhesiveness to an active layer of an organic photoelectric conversion element. ##STR00001## {R.sup.1-R.sup.6 are each independently a hydrogen atom, a halogen atom, a nitro group, a cyano group, a sulfonic acid group, a C.sub.1-C.sub.20 alkoxy group, a C.sub.1-C.sub.20 thioalkoxy group, a C.sub.1-C.sub.20 alkyl group, etc. Meanwhile, one of R.sup.1-R.sup.4 is a sulfonic acid group and at least one of the remaining R.sup.1-R.sup.4 is a C.sub.1-C.sub.20 alkoxy group, a C.sub.1-C.sub.20 thioalkoxy group, a C.sub.1-C.sub.20 alkyl group, etc., and m and n are numbers that satisfy 0≤m≤1, 0≤n≤1, and m+n=1.}

A crosslinked polyimide, a polyimide film and a method for preparing thereof, an organic light emitting diode (OLED) device. 4,40-diamino-400-N-carbazolyltriphenylamine and 1,2,4,5-cyclohexanetetracarboxylic dianhydride and a p-xylylenediamine crosslinker are introduced in the present invention. The introduction of a diamine monomer with a large volume of pendant groups increases an asymmetry of the polyimide, destroys a close structure of the polymer, and reduces crystallization properties of the polypolymer, thereby effectively increasing its transmissibility. At the same time, a cross-linked agent, p-xylylenediamine, is introduced, and the cross-linked agent widens a molecular chain spacing, so that the polyimide molecule has a larger free volume. At the same time, the formation of cross-linked is beneficial to reduce a polarizability of the molecule, thereby reducing a dielectric constant of the material. An OLED device with a novel low dielectric constant and high transmittance is prepared in this way.

The present invention discloses a light-emitting electrochemical cell, which includes a first electrode, a light-emitting layer, and a second electrode which are stacked, wherein the light-emitting layer includes a light-emitting material and an ion conductive polymer. The present invention also discloses an electroluminescent display device, including a glass substrate, a thin film transistor, a light-emitting electrochemical cell, a protective layer, and a polarizer. Embodiments of the present application provide a light-emitting electrochemical cell and an electroluminescence display device, wherein the electro-luminescence display device is construed by providing a simple structure and manufacturing process to the light-emitting electrochemical cell, and therefore the manufacturing cost is reduced, and the production efficiency is improved.

The present invention relates to a light emitting device including a light emitting layer having a stacked structure of two or more layers in which the light emitting layer is alternately disposed with a first light emitting material layer and a second light emitting material layer. In addition, the light-emitting material layer is a perovskite layer or an organic material layer, the first light-emitting material layer and the second light-emitting material layer are characterized in that they have different band gaps. By alternately disposing the first light emitting material layer and the second light emitting material layer to have a stacked structure and by controlling the energy level, there is an advantage in that the electroluminescence efficiency can be improved by controlling the electron-hole recombination region of the light emitting device. In addition, there is an advantage that a white light emitting device can be manufactured by controlling the energy levels of the first light emitting material layer and the second light emitting material layer.

The present specification relates to a polymer comprising a unit represented by Chemical Formula 1, a monomer represented by Chemical Formula 2, a coating composition comprising the same, an organic light emitting device formed using the same, and a method for manufacturing an organic light emitting device using the same:

##STR00001##

wherein the variables are described herein.

A light-emitting composition comprising: a light-emitting group and a polymer comprising: a repeat unit of formula Ar.sup.1 wherein Ar.sup.1 is an arylene repeat unit which is unsubstituted or substituted with one or more substituents; and a repeat unit of formula (I): (I) wherein Ar.sup.2 and Ar.sup.3 each independently represent a C.sub.6-20 arylene group or a 5-20 membered heteroarylene group which is unsubstituted or substituted with one or more substituents and CB represents a conjugation-breaking group which does not provide a conjugation path between Ar.sup.2 and Ar.sup.3; wherein the polymer has a solubility in water or a C.sub.1-8 alcohol at 20° C. of at least 0.1 mg/ml. The composition may be a light-emitting polymer in which the polymer contains the light-emitting group. The light-emitting composition may be part of a particle containing the polymer and a matrix material, e.g. silica. The light-emitting composition may be used in an assay for detection of a target analyte.

A polymer, a quantum dot composition, and a light-emitting device employing the same are provided. The polymer includes a first repeat unit that has a structure represented by Formula (I):

##STR00001##

wherein the definitions of R.sup.1, R.sup.2, A.sup.1, A.sup.2, A.sup.3, and Z.sup.1 and n are as defined in the specification.

A composition for forming organic film, a display device utilizing the composition, and a method of manufacturing the display device are provided. The composition for forming an organic film includes a solvent; and a compound of Formula 1:
ArR).sub.k.  Formula 1