KR102420296B1 - A composition, a gel polymeric electrolyte, and an electrochemical light emitting element - Google Patents

Abstract

The present application relates to an electrolyte composition, a polymer electrolyte, and an electrochemical light emitting device. The present application may provide an electrochemical light emitting device having excellent long-term driving durability and electrochemical stability.

Description

Electrolyte composition, polymer electrolyte and electrochemical light emitting element {A composition, a gel polymeric electrolyte, and an electrochemical light emitting element}

The present application relates to an electrolyte composition, a polymer electrolyte, and an electrochemical light emitting device.

The electrochemical light emitting device is a self-luminous device using phosphorescence generated when an oxidizing agent and a reducing agent generated through a redox reaction of a light emitting dye collide in an electrolyte layer. The device may be configured to include an electrolyte composed of an organic solvent and a supporting salt and a light emitting material dissolved in the electrolyte in one layer, such as a light emitting layer or an electrolyte layer. there is

In order to prevent leakage of the electrolyte, the use of an all-solid electrolyte using an inorganic component or a gel polymer electrolyte using a polymer has been proposed. However, the inorganic component of the all-solid electrolyte has a problem of poor electrical properties. In addition, in the case of a gel polymer electrolyte, there is a problem in that impurities derived from a polymerization initiator used in the process of polymerizing the polymer electrolyte, that is, unreacted substances or decomposition products thereof, impair the light emitting characteristics and stability over time of the device.

Japanese Patent Laid-Open No. 2004-327271

An object of the present application is to provide an electrolyte composition capable of preventing deterioration of light emitting characteristics and driving performance of an electrochemical light emitting device due to the use of an initiator and the like, and improving processability.

Another object of the present application is to provide a polymer electrolyte formed from the electrolyte composition.

Another object of the present application is to provide an electrochemical light emitting device including the polymer electrolyte.

The above and other objects of the present application can all be solved by the present application described in detail below.

In an example related to the present application, the present application relates to an electrolyte composition. The electrolyte composition of the present application may be used to form a urethane-based polymer electrolyte, as will be described below.

The electrolyte composition of the present application may be configured such that a matrix of a gel polymer electrolyte formed after curing or polymerization of the composition has a urethane bond. Specifically, the electrolyte composition of the present application may include at least two different polyols and an isocyanate compound. In the present application, a polyol may mean a polyhydric alcohol having two or more —OH groups.

In one example, the electrolyte composition may include (A) an ethoxylate of a compound represented by the following Chemical Formula 1 as a polyol.

[Formula 1]

(RCH ₂ ) _n C(CH ₂ OH) _m

(However, in Formula 1, R is an alkyl group, n is 0 or 1, and m is 3 or 4)

As the compound of Formula 1, trimethylolpropane or pentaerythritol may be used. In addition, as the ethoxylate (A) of the ethylene oxide-derived material with respect to Chemical Formula 1, that is, the compound of Chemical Formula 1, trimethylolpropane ethoxylate or pentaerythritol ethoxylate) can be used.

The (A) ethoxylated of the compound represented by Formula 1 is a trifunctional and tetrafunctional alcohol, respectively, which forms a urethane bond with the isocyanate compound described below and at the same time forms a polymer matrix having a crosslinked structure. can

In one example, (A) the ethoxylated of the compound represented by Formula 1 may have a number average molecular weight (Mn) in the range of 100 to 1,500. For example, the number average molecular weight may be 100 or more, 150 or more, 200 or more, 250 or more, or 300 or more, and the upper limit thereof may be 1,500 or less, 1,200 or less, 1,000 or less, 800 or less, or 600 or less. When it has the above range, it is possible to form a urethane-based polymer having an appropriate viscosity. The number average molecular weight is a value measured according to a known method, and may be, for example, a value converted to standard polystyrene measured using a gel permeation chromatograph (GPC).

In one example, the trimethylolpropane ethoxylate, which is one of the ethoxyides (A) satisfying the number average molecular weight, may be represented by Formula 2 below.

[Formula 2]

However, in Formula 2, n is a number between 3 and 60.

In one example, the pentaerythritol ethoxylate, which is one of the ethoxyides (A) satisfying the number average molecular weight, may be represented by Formula 3 below.

[Formula 3]

However, in Formula 3, n is a number between 3 and 60.

In addition, the electrolyte composition may further include (B) (poly)ethylene glycol as a polyol. (Poly) ethylene glycol is a difunctional alcohol that not only forms a urethane bond with an isocyanate described below, but also functions as a kind of ion transporter. In particular, since ethylene glycol interacts with the cations of the ionic liquid described below, it has a high retention capacity for the ionic liquid. Therefore, it is possible to impart stability to the electrolyte, such as preventing a polarization phenomenon in which anions and cations of the ionic liquid aggregate into opposite electrodes.

In one example, the (B) ethylene glycol may have a number average molecular weight in the range of 200 to 10,000. For example, the number average molecular weight may be 200 or more, and the upper limit thereof may be 10,000 or less, 5,000 or less, 3,000 or less, 1,000 or less, or 800 or less. When it has the above range, it is possible to form a urethane-based polymer having an appropriate viscosity.

The composition of the present application includes (C) an isocyanate compound capable of reacting with the polyol components in order to have a polymer crosslinking matrix formed by urethane bonds after curing. (C) As the isocyanate compound, monofunctional or polyfunctional isocyanate may be used.

In one example, the (C) isocyanate compound may include a polyfunctional isocyanate. By polyfunctional isocyanate is meant a compound comprising two or more isocyanate groups. The kind of polyfunctional isocyanate is not particularly limited, and for example, hexamethylene diisocyanate, 1,3,3-trimethyl hexamethylene diisocyanate, isophorone diisocyanate, toluene-2,6-diisocyanate, 4,4' - A diisocyanate such as dicyclohexane diisocyanate may be used, or, for example, a trifunctional or more than trifunctional isocyanate such as DN950 or DN980 of DIC Corporation may be used.

In the present application, the content ratio between substances involved in the urethane bond may be determined based on the number of moles of functional groups. For example, the number of moles of -OH functional groups in the polyol may be greater than the molar ratio of -NCO functional groups in the isocyanate compound. Specifically, the molar ratio (OH/NCO) of the -NCO functional group of the (C) isocyanate compound to the -OH functional group of the (A) ethoxylate and (B) (poly)ethylene glycol may be 1 or more. The upper limit of the molar ratio is not particularly limited, but may be, for example, 7 or less, 6 or less, 5 or less, or 4 or less. More specifically, the molar ratio (OH/NCO) of the functional groups may be in the range of 1 to 3 or less, or 1 to 2 or less. When the number of moles of the NCO functional groups is greater than the number of moles of the OH functional groups, the electrochemical stability of the device may be deteriorated due to the remaining NCO functional groups. In addition, when the molar ratio (OH / NCO) value exceeds the above range, sufficient urethane-type reaction does not occur, so sufficient viscosity required for the composition or electrolyte layer cannot be realized, and the mechanical properties of the matrix formed after curing may be low. .

In the case of an acrylic electrolyte widely used as a polymer electrolyte, an initiator is required during curing to form a matrix, but an initiator is not required in the present application for forming a crosslinked structure of a polymer matrix through a urethane bond. That is, in the case of the present application using (A) the ethoxyide of the compound represented by Formula 1, (B) (poly)ethylene glycol, and (C) an isocyanate compound, a cross-linking structure for forming a polymer electrolyte without an initiator was obtained. can be formed Therefore, it is possible to prevent in advance the adverse effects that unreacted substances and decomposition products derived from the initiator have on the device.

The electrolyte composition may further include a light emitting material. Examples of the light emitting material include a Ru compound and its complex, an Ir compound and its complex, an Os compound and its complex, a Pt compound and its complex, a Rh compound and its complex, a Re compound and its complex, and a Pd compound and its complex. Complexes, or other various fluorescent or phosphorescent organic materials known in the art can be used. For example, Alq series such as tris(4-methyl-8-quinolinolate)aluminum(III)(tris(4-methyl-8-quinolinolate)aluminum(III))(Alg3), 4-MAlq3 or Gaq3 material of, C-545T(C26H26N2O2S), DSA-amine, TBSA, BTP, PAP-NPA, spiro-FPA, PhSi(PhTDAOXD), PPCP(1,2,3,4,5-pentaphenyl-1,3-cyclopentadiene) ), such as cyclopenadiene derivatives, DPVBi(4,4'-bis(2,2'-diphenylyinyl)-1,1'-biphenyl), distyryl benzene or its derivatives, or DCJTB(4-(Dicyanomethylene) -2-tert-butyl-6-(1,1,7,7,-tetramethyljulolidyl-9-enyl)-4Hpyran), DDP, AAAP, NPAMLI, ; or Firpic, m-Firpic, N-Firpic, bon2Ir(acac), (C6)2Ir(acac), bt2Ir(acac), dp2Ir(acac), bzq2Ir(acac), bo2Ir(acac), F2Ir(bpy), F2Ir (acac), op2Ir(acac), ppy2Ir(acac), tpy2Ir(acac), FIrppy(fac-tris[2-(4,5'-difluorophenyl)pyridine-C'2,N]iridium(III)) or Btp2Ir Phosphorescent materials such as (acac)(bis(2-(2'-benzo[4,5-a]thienyl)pyridinato-N,C3')ridium(acetylactonate)) may be exemplified, but the present invention is not limited thereto. . In addition, the light emitting layer includes the material as a host, and also perylene, PVB (polyvinyl butyral), DPA (9,10-diphenylanthracene), 5,12-ziphenirtetra Seine, pyrene, distyrylbiphenyl (distyrylbiphenyl), DPT, quinacridone (quinacridone), rubrene (rubrene), BTX, ABTX or DCJTB containing as a dopant - may have a dopant system (Host-Dopant system) have.

In one example, the composition may further include an ionic liquid. In the present application, an ionic liquid is a compound containing an organic cation and an organic or inorganic anion. Since the size of the cation and the anion is relatively large, packing is not good, so the lattice energy is low, and the melting point is It may mean a salt that is 100° C. or less. These ionic liquids may be present in a matrix or polymer network formed within the cured composition. In addition, since the ionic liquid has a low vapor pressure as well as a melting point, volatilization may hardly occur, and thus, a relatively high level of ionic conductivity may be provided for a long time.

The types of cations and anions included in the ionic liquid are not particularly limited.

In one example, the cations included in the ionic liquid include a pyridinium cation, a piperidinium cation, a pyrrolidinium cation, a cation having a pyrroline skeleton, a cation having a pyrrole skeleton, an imidazolium cation, tetrahydropyri a midinium cation, a dihydropyrimidinium cation, a pyrazolium cation, a pyrazolinium cation, a tetraalkylammonium cation, a trialkylsulfonium cation, or a tetraalkylphosphonium cation. If one or more cations of the above type are included, the specific type of the cation is not particularly limited.

In one example, the anion included in the ionic liquid is, F ⁻ , Cl ⁻ , Br ⁻ , I ⁻ , NO ₃ ⁻ , (CN) ₂ N ⁻ , BF ₄ ⁻ , ClO ₄ ⁻ , RSO ₃ ⁻ (wherein , R is an alkyl group or phenyl group having 1-9 carbon atoms), RCOO ^- (wherein R is an alkyl group or phenyl group having 1-9 carbon atoms), PF ₆ ^- , (CF ₃ ) ₂ PF ₄ ^- , (CF ₃ ) ₃ PF ₃ ^- , (CF ₃ ) ₄ PF ₂ ^- , (CF ₃ ) ₅ PF ^- , (CF ₃ ) ₆ P ^- , (CF ₃ SO ₃ ^- ) ₂ , (CF ₂ CF ₂ SO ₃ ^- ) ₂ , (C ₂ F ₅ SO ₂ ) ₂ N ^- , (CF ₃ SO ₃ ) ₂ N ^- , (CF ₃ SO ₂ )(CF ₃ CO)N ^- , CF ₃ CF ₂ (CF ₃ ) ₂ CO ^- , (CF ₃ SO ₂ ) ) ₂ CH ^- , (SF ₅ ) ₃ C ^- , (CF ₃ SO ₂ ) ₃ C ^- , CF ₃ (CF ₂ ) ₇ SO ₃ ^- , CF ₃ COO ^- , C ₃ F ₇ COO ^- , CF ₃ SO ₃ ^- , or C ₄ F ₉ SO ₃ ^- It may be, but is not particularly limited thereto.

In one example, the composition may further include a solvent. The type of solvent is not particularly limited, and for example, a known carbonate-based solvent may be used. As a non-limiting example, PC (propylene carbonate), EC (ethylene carbonate), DMC (dimethyl carbonate), DEC (diethyl carbonate), ) or a solvent such as EMC (ethylmethyl carbonate) may be included in the composition.

In one example, the electrolyte composition may have a viscosity in the range of 500 to 100,000 cps. For example, the composition can have a viscosity of 500 cps or more, 1,000 cps or more, 3,000 cps or more, 5,000 cps or more, 7,000 cps or more, 9,000 cps or more, 10,000 cps or more, or 30,000 cps or more, and 100,000 cps or less, 80,000 or more. It may have a viscosity of cps or less, 60,000 cps or less, 50,000 cps or less, 40,000 cps or less, or 30,000 cps or less. When the electrolyte layer is formed from the composition satisfying the above range, the movement and redox reaction of the light emitting material included for electrochemical emission may be actively performed. The viscosity, for example, can be measured while changing the shear rate (shear rate) in the range of 10 ^-2 to 10 ³ (s ^{- 1} ).

In another example related to the present application, the present application relates to a urethane-based polymer electrolyte including a cured product of the electrolyte composition. The electrolyte may be prepared by the method described below.

In another example related to the present application, the present application relates to a method for manufacturing a urethane-based polymer electrolyte. The polymer electrolyte can be prepared by curing the polymer electrolyte composition described above under predetermined conditions.

The method for preparing the polymer electrolyte may include curing the composition of the above-described configuration at a low temperature. The low temperature may be, for example, a temperature below a decomposition temperature (Td) at which a compound component used to form a polymer matrix is thermally decomposed. Specifically, the low temperature may mean a temperature of 200 ℃ or less. More specifically, the curing temperature may be 50 °C or higher, 60 °C or higher, or 70 °C or higher, and 190 °C or lower, 180 °C or lower, or 170 °C or lower. When the composition having the above configuration is cured, curing can occur sufficiently even within the above range, and a gel polymer electrolyte having excellent durability can be provided. In particular, in the present application, even at a low temperature and relatively short curing for several tens of minutes to several hours, sufficient curing can be achieved to provide a gel polymer electrolyte suitable for an electrochemical device. The curing time may be, for example, 1 hour to 4 hours, 1 hour to 3 hours, or 1 hour to 2 hours.

In one example, properties of the light irradiated for curing are not particularly limited. For example, 200 nm to 400 nm wavelength band of UV light 300 J / cm ² to 3,000 J / cm ² Curing can be achieved by irradiating with an exposure dose in the range.

With respect to the method for producing a polymer electrolyte, since the polyol and the isocyanate compound included in the composition have excellent reactivity or bonding strength between them in forming a urethane bond, a separate photoinitiator and / Alternatively, the catalyst may not be included. Accordingly, according to the present application, it is possible to prevent a decrease in the light emitting characteristics of a device or a decrease in stability over time due to impurities derived from an initiator or a catalyst.

In another example related to the present application, the present application relates to an electrochemical light emitting device. The light emitting device may include a plurality of electrodes and an electrolyte layer. The composition and characteristics of the electrolyte layer are the same as those described above. Since the electrolyte layer does not include a polymerization initiator, a catalyst, or a compound derived therefrom, which may be electrochemically recognized as impurities, it has excellent driving characteristics.

In the present application, the shape of the electrochemical light emitting device is not particularly limited. For example, the device may be a so-called sandwich type device in which an electrolyte layer including a light emitting material is interposed between two electrodes facing each other. Alternatively, instead of arranging a plurality of electrodes to face each other via an electrolyte layer, the device may have a form in which two or more electrodes having the same or different areas are simultaneously provided on the same surface of the electrochemical emission layer.

The kind of material contained in the electrode is not particularly limited as long as it has conductivity and transparent properties. In one example, the electrode layer may include a transparent conductive oxide. Examples of the transparent conductive oxide include Indium Tin Oxide (ITO), In ₂ O ₃ (indium oxide), IGO (Indium Galium Oxide), Fluor doped Tin Oxide (FTO), Aluminum doped Zinc Oxide (AZO), Galium doped (GZO). Zinc Oxide), ATO (Antimony doped Tin Oxide), IZO (Indium doped Zinc Oxide), NTO (Niobium doped Titanium Oxide), ZnO (Zink Oxide), or CTO (Cesium Tungsten Oxide) may be mentioned, but are limited thereto. not.

In one example, the electrode may have a thickness of 1 nm to 10 um. When the thickness of the electrode is adjusted within the above range, the voltage drop applied to the electrolyte layer from the power source through the electrode can be reduced, and the light emitting characteristic of the electrolyte layer can be stably secured.

In one example, the device may further include a light-transmitting substrate on one surface of the electrode layer, which is an outer surface of the device. It may be a laminate of a light-transmitting substrate having a transmittance of about 50% to about 90% for visible light. In the present application, visible light may mean a wavelength of light in the range of 380 nm to 780 nm, more specifically, a wavelength of 550 nm. The type of the light-transmitting substrate is not particularly limited, and for example, transparent glass or a polymer resin may be used. More specifically, a polyester film such as PC (Polycarbonate), PEN (poly(ethylene naphthalate)) or PET (poly(ethylene terephthalate)), an acrylic film such as PMMA (poly(methyl methacrylate)), or PE (polyethylene) Or a polyolefin film such as PP (polypropylene) may be used, but is not limited thereto.

In one example, the electrochemical light emitting device may further include a sealant. The shape or composition of the sealant is not particularly limited, but may include, for example, an epoxy compound, and is provided to surround the side of the light emitting electrolyte layer to protect the light emitting electrolyte layer from external moisture, etc. It is possible to prevent the components from leaking to the outside.

The electrochemical light emitting device may further include a power source. As the power source, DC or AC power may be used without limitation. In one example, the frequency of the voltage applied by the AC power source may be in the range of 40 Hz to 800 Hz, but is not limited thereto. In addition, a method of applying a voltage or a range of a voltage applied to the power source may be appropriately selected by those skilled in the art in consideration of the characteristics of materials used in the device.

According to an example of the present application, an electrochemical light emitting device having excellent long-term driving durability and electrochemical stability may be provided.

1 is an experimental result showing that the electrolyte composition used in Examples was cured at a low temperature.
2 is a graph showing the comparison of electrochemical stability of Example having a urethane-based matrix and Comparative Example 1 having an acrylic matrix.
3 is a graph comparing driving durability of devices manufactured according to Examples and Comparative Examples.

Hereinafter, the present application will be described in detail through examples. However, the protection scope of the present application is not limited by the examples described below.

Characterization and Measurement Methods

*Low temperature curing: In order to check whether the composition prepared in the following experimental example was cured at a low temperature, the curing temperature of the composition was constantly adjusted to 70 ° C., and IR was measured to confirm the ratio between the unreacted material and the reacted material. It can be confirmed that the peak disappears in the range of about 2275 cm ^-1 related to the isocyanate group in the IR graph when the curing is completely progressed at low temperature. 1 shows an IR graph according to the time that curing proceeds at a temperature of 70° C. in this regard.

*Electrochemical stability: Cyclic voltammetry (CV) was measured to confirm the electrochemical stability of the device driving material. The manufacturing method of the device is the same as in the experimental example described below. In the CV measurement, the electrodes used were as follows.

- Working electrode: glassy carbon, Pt electrode

- Counter electrode: Pt wire

- Reference electrode: Ag/Ag ⁺

Before measuring CV, nitrogen (N ₂ ) was purged for about 20 minutes to remove oxygen dissolved in the measurement solution. During CV measurement, 100 scans were repeated in the same potential range to measure the electrochemical stability through the degree of change in the oxidation/reduction peaks of the luminescent material.

* Driving time: The same AC voltage was applied to both electrodes for the device manufactured in the following experimental example, and the characteristics of IVL over time were checked.

Example and comparative example

Example One

Preparation of composition (mixture): 0.06M of (dFppy) ₂ Ir(bpy) was dissolved in 0.233 mL of PC (propylene carbonate) solvent, and the concentration of TBA-TFSI (tetrabutylammonium bis(trifluoromethyl-sulfonyl)imide), an ionic liquid was mixed to make 0.75 M. Thereafter, PEG (polyethylene glycol) having a number average molecular weight of 400, TMPE (trimethylolpropane ethoxylate) having a number average molecular weight of 450, and HDI (hexamethylene diisocyanate) were mixed in a molar ratio of 1.125:0.375:1.000. To a volume of 0.038 mL, it was mixed with the PC solution.

Fabrication of device: On the other hand, two ITO electrode structures opposed to each other as a so-called sandwich structure by side sealing using a sealant having a barrier property, and then a UV curing machine (Hbulb) ) of about 2,000 mJ/cm ² was irradiated with light. Then, make an ITO sandwich structure by making a hole in the ITO located on the upper side, and after injecting the mixed solution into the hole, the hole is closed using a sealant (end sealing), and about 1,000 mJ/cm ² in the V curing machine (H-bulb) of light was irradiated. Thereafter, the laminate was cured at 70° C. to prepare an electrochemical light emitting device having a urethane-based polymer electrolyte.

Example 2

An electrochemiluminescent device was prepared in the same manner as in Example 1, except that the molar ratio of PEG, TMPE, and HDI was adjusted to 0.75:0.75:1.000.

Example 3

An electrochemiluminescent device was prepared in the same manner as in Example 1, except that the molar ratio of PEG, TMPE, and HDI was adjusted to 0.375:1.125:1.000.

Comparative Example 1

Instead of mixing the mixture of PEG, TMPE, and HDI with the PC solution, a mixture containing 1 wt% of 9-ethylene glycol diacrylate (9-EGDA), an acrylate-based photocurable material, and Igacure127 (I127), an initiator, is used in the PC solution. mixed with the solution. Other than that, an electrochemical light emitting device was manufactured in the same manner as in Example 1.

Comparative Example 2

Instead of mixing the mixture of PEG, TMPE, and HDI with the PC solution, a mixture of PEG and HDI in a molar ratio of 1.500:1.000 was mixed with the PC solution. Other than that, an electrochemical light emitting device was manufactured in the same manner as in Example 1.

Comparative Example 3

Instead of mixing the mixture of PEG, TMPE, and HDI with the PC solution, a mixture of TMPE and HDI in a molar ratio of 1.500:1.000 was mixed with the PC solution. Other than that, an electrochemical light emitting device was manufactured in the same manner as in Example 1.

From Figure 1, in the case of the urethane curing used in the example, even at a low temperature of 70 ℃, even if cured for only 1 hour, it can be confirmed that the peak regarding the N = C = O group that can be observed at a wavelength of 2,000 to 2,500 does not appear. can This is that, in the case of an embodiment in which the molar ratio of the configuration having the N=C=O group is adjusted, a urethane bond is formed even if curing proceeds for a relatively short time at a low temperature, and an electrolyte that can be used in a polymer electrolyte for an electrochemical light emitting device can be generated. means that

Referring to FIG. 2 , it can be confirmed that the redox peak of the device of Comparative Example 1 used as the 9-EGDA matrix gradually decreased, but the device of Example 1 did not. Since an initiator is additionally used when an acrylate-based polymer electrolyte rather than a urethane-based polymer electrolyte is prepared, it can be seen that the initiator itself or a material derived therefrom acts as an impurity to reduce the electrochemical stability of the device.

Referring to FIG. 3 , it can be seen that the devices of Comparative Examples 1 and 3, which have very short lifetimes, are difficult to use as electrochemical light emitting devices. Since the durability of the matrix is lowered, it can be seen that the driving durability is not good.

Claims (15)

(A) an ethoxylate of a compound represented by the following formula (1), (B) (poly) ethylene glycol, and (C) an isocyanate compound,
A composition for a urethane-based polymer electrolyte in which the molar ratio (OH/NCO) of the NCO functional group of the (C) isocyanate compound to the OH functional group of the (A) ethoxylate and (B) (poly)ethylene glycol is 1 or more:
[Formula 1]
(RCH ₂ ) _n C(CH ₂ OH) _m
(However, in Formula 1, R is an alkyl group, n is 0 or 1, and m is 3 or 4). The composition for a urethane-based polymer electrolyte according to claim 1, wherein the compound represented by Formula 1 is trimethylolpropane or pentaerythritol. The composition for a urethane-based polymer electrolyte according to claim 1, wherein the number average molecular weight of the (A) ethoxylate is in the range of 100 to 1,500. The composition for a urethane-based polymer electrolyte according to claim 1, wherein the number average molecular weight of (B) (poly)ethylene glycol is in the range of 200 to 10,000. The composition for a urethane-based polymer electrolyte according to claim 1, wherein the (C) isocyanate compound is a polyfunctional isocyanate. The composition for a urethane-based polymer electrolyte according to claim 1, wherein the composition for a urethane-based polymer electrolyte does not contain a polymerization initiator and a catalyst. The composition for a urethane-based polymer electrolyte according to claim 1, further comprising a light-emitting material that is a complex of a metal element selected from Ru, Ir, Os, Pt, Rh, Re, and Pd. The composition for a urethane-based polymer electrolyte according to claim 1, comprising an ionic liquid. The composition for a urethane-based polymer electrolyte according to claim 1, having a viscosity in the range of 500 to 100,000 cps. A urethane-based polymer electrolyte comprising a cured product of the composition according to claim 1 . (A) curing a composition comprising an ethoxylate of a compound represented by the following formula (1), (B) (poly)ethylene glycol, and (C) an isocyanate compound at a temperature of 200° C. or less,
In the composition, the molar ratio (OH/NCO) of NCO, which is a functional group of the (C) isocyanate compound, and OH, which is a functional group of (A) ethoxylate and (B) (poly)ethylene glycol, is a urethane-based polymer having a value of 1 or more. Method for preparing the electrolyte:
[Formula 1]
(RCH ₂ ) _n C(CH ₂ OH) _m
(However, in Formula 1, R is an alkyl group, n is 0 or 1, and m is 3 or 4). The method of claim 11, wherein the composition does not contain a polymerization initiator and a catalyst. a plurality of electrodes; and an electrolyte layer comprising the urethane-based polymer electrolyte according to claim 10; The electrochemical light emitting device of claim 13, wherein the electrode comprises a transparent conductive oxide. The electrochemical light emitting device according to claim 13, wherein the electrolyte layer further comprises a light emitting material that is a complex of a metal element selected from Ru, Ir, Os, Pt, Rh, Re, and Pd.

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