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  • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
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  • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
  • H01G9/20—Light-sensitive devices
  • H01G9/2059—Light-sensitive devices comprising an organic dye as the active light absorbing material, e.g. adsorbed on an electrode or dissolved in solution
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  • H10K85/324—Metal complexes comprising a group IIIA element, e.g. Tris (8-hydroxyquinoline) gallium [Gaq3] comprising aluminium, e.g. Alq3
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  • Y02E10/542—Dye sensitized solar cells
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  • Y02E10/00—Energy generation through renewable energy sources
  • Y02E10/50—Photovoltaic [PV] energy
  • Y02E10/549—Organic PV cells

Definitions

• the present invention relates to a light absorbing material, and more particularly to a light absorbing composition useful in a photoelectric conversion element such as a solar cell.
• the photoelectrochemical solar cell can form a junction only by immersing the semiconductor in an electrolytic solution, and can expect relatively high photoelectric conversion efficiency even if a polycrystalline material is used. For reasons it is considered a potentially excellent solar cell.
• At least one of a pair of electrodes emits light. It employs a method of generating electromotive force by absorption, and it is said that, in particular, those using titanium dioxide electrodes have extremely high efficiency.
• the photosensitizer constituting the photoelectrochemical solar cell together with such an electrode for example, Hironori Arakawa et al., “Taiyo Energy”, Vol. 23, No. 4, pages 11 to 18 (1997) And Takayuki Kitamura et al., “Surface Chemistry,” Vol. 21, No. 5, pp. 288-293 (2000), etc. are proposed.
• an object of the present invention is to provide a light-absorbing composition that provides improved photoelectric conversion efficiency in a photoelectric conversion element such as a solar cell, and an application thereof. Disclosure of the invention
• the present inventor has conducted extensive research on combinations of various types of organic compounds including light-emitting organic compounds, and has searched.As a result, they absorb light in the ultraviolet or visible region and emit light having a wavelength longer than the absorbed light.
• a light-emitting organic compound and a light-absorbing organic compound that absorbs the emitted light are combined and applied to a photoelectric conversion element, a significantly higher photoelectric conversion efficiency that cannot be easily attained with only the latter light-absorbing organic compound alone Is achieved.
• the present invention absorbs light in the ultraviolet region or the visible region, and Solution to the Problems by providing a light-absorbing composition comprising a first organic compound that emits light of a longer wavelength and a second organic compound that absorbs light emitted by the first organic compound It is.
• the present invention solves the above-mentioned problem by providing a semiconductor electrode sensed by the light absorbing composition.
• the present invention solves the above-mentioned problem by providing a photoelectric conversion element using the light absorbing composition.
• the present invention solves the above-mentioned problem by providing a solar cell using the light-absorbing composition.
• FIG. 1 is a schematic diagram of a photoelectric conversion element according to the present invention.
• FIG. 2 is a schematic diagram showing an absorption region and a light emission region of the first and second organic compounds used in the embodiment of the present invention. Explanation of reference numerals
• the present invention absorbs light in the ultraviolet region to the visible region and emits light having a longer wavelength than the absorbed light.
• the present invention relates to a light-absorbing composition comprising a first organic compound that emits light and a second organic compound that absorbs light emitted by the first organic compound.
• the first organic compound constituting the light-absorbing composition according to the present invention usually absorbs light in the ultraviolet region to the visible region having a wavelength shorter than 800 nm, and emits light in the visible region to red having a wavelength longer than 400 ⁇ m. Those that emit fluorescence or phosphorescence in the outer region are selected.
• the first organic compound does not need to be a single compound, but may have different emission ranges, if necessary, while taking into account the application of the light-absorbing composition and the light-absorbing properties of the second organic compound used in combination. These luminescent organic compounds may be used in an appropriate combination.
• As the second organic compound a light-absorbing organic compound capable of substantially absorbing the light emission of the first organic compound is selected. Depending on the use of the light-absorbing composition, the light-emitting organic compound may be used as needed. A plurality of light-absorbing organic compounds having different light-absorbing ranges may be used in an appropriate combination so that the sensitivity to light becomes a desired level.
• the first organic compound include, for example, an oxazole compound or a coumarin compound that absorbs light in the ultraviolet region or the blue region and emits fluorescence or phosphorescence in the blue region near the wavelength of 400 to 500 nm, or a wavelength of 500 to 500 nm.
• Light emitting organic compounds such as perylene compounds that emit fluorescence or phosphorescence in the green region around 600 nm and organometallic complexes that emit fluorescence or phosphorescence in the red region longer than 600 nm, are mentioned above. As described above, these are used in appropriate combinations as needed.
• the light-absorbing composition when used as a photosensitizer in a photoelectric conversion element such as a photoelectrochemical solar cell, for example, L'Ell'Melby et al. 'American Chemical Society', Vol. 86, Vol. 23, 5, 11, 17 to 5, 125, pp. 1964, Masahiro Hiroka's Ekapla et al. Chemical Society of Japan, Vol. 1, Vol. 9, No. 2, 2, 53-3, 2, 258 (1992), Sergei Ramansky et al., The Journal. Ob 'The' American Chemical 'Society, Vol. 1 23, No. 18, pp.
• Organometallic complexes with atoms are preferred, and among them, coordination to palladium as a central atom and pium as a central atom, because emission is sharp and the emission region is hardly affected by the ligand.
• An enedionediolate complex comprising three or four molecules of enedione compound is particularly preferred.
• the second organic compound a light-absorbing organic compound commonly used in the field of photoelectrochemical solar cells is used alone as a photosensitizer, or a plurality of such light-absorbing organic compounds are appropriately used in combination.
• the light-absorbing organic compound that can be used as the second organic compound include, for example, an azurenium dye, an oxonol dye, a cyanine dye, a squarylium dye, a styryl dye, a thiopyriium dye, a pyrylium dye, a phenanthrene dye, and a phthalocyanine dye.
• Polymethine dyes such as melocyanine dyes; further, acridine dyes, azazanulene dyes, azo dyes, anthraquinone dyes, indigo dyes, indanthrene dyes, oxazine dyes, xanthene dyes, Coumarin-based dyes, dioxazine-based dyes, thiazine-based dyes, thioindigo-based dyes, pertrafylazine-based dyes, triphenylmethane-based dyes, triphenothiazine-based dyes, naphthoquinone-based dyes, phthalocyanine-based dyes, benzoquinone-based dyes, benzopyrans Color , Benzofuranone-based dyes, porphyrin dyes, rhodamine dyes, such as pyrromethene dyes and the like, if necessary, they are used in combination as appropriate.
• polymethine dyes such as cyanine dyes and coumarin dyes.
• the same patent applicant filed Japanese Patent Application No. 2001-18585 in that light absorption characteristics are unlikely to change even when attached to a semiconductor electrode.
• No. 666 Tile of Invention "Ethyleneation Compound J)
• each hydrogen atom bonded to the carbon atom at position 1 in the ethylene skeleton is replaced by an atomic group and a hydrocarbon group capable of absorbing visible light, respectively
• Coumarin-based dyes and polymethine-based dyes in which one of the hydrogen atoms bonded to the carbon atom at the 2-position is replaced by an atomic group containing an atom having an unshared electron pair are particularly preferred.
• the emission quantum efficiency of the first organic compound and the molecular absorption coefficient of the second organic compound (hereinafter, the molecular absorption coefficient is abbreviated as “ ⁇ ”)
• the first organic compound is usually added in an amount of 0.1 mol or more, preferably 0.5 mol or more, per 1 mol of the second organic compound. It is needless to say that the first and second organic compounds referred to in the present invention do not need to be a single organic compound at all, as described above. In consideration of the above, one or both of them may be configured by appropriately combining a plurality of organic compounds.
• the light-absorbing composition of the present invention must not be limited to those composed of an organic compound having a specific light-absorbing region or light-emitting region, so that the composition as a whole has desired light-absorbing characteristics.
• the first and second organic compounds for example, one or more other light-absorbing organic compounds that absorb light in the ultraviolet, visible, and infrared regions or the infrared region may not be appropriately mixed.
• the use of the light-absorbing composition according to the present invention will be described.
• the light-absorbing composition of the present invention can have a light-absorbing ability in a desired wavelength range from an ultraviolet region to a visible region. Extremely useful.
• the light-absorbing composition according to the present invention which has an excellent affinity for a semiconductor, is extremely useful as a material for sensitizing a semiconductor electrode applied to a photoelectric conversion element such as a solar cell, specifically, a photoelectrochemical solar cell. Useful.
• a semiconductor electrode sensitized by the light absorbing composition of the present invention and a photoelectric conversion element using the semiconductor electrode can be obtained by sensitizing a semiconductor electrode generally used for a photoelectrochemical solar cell or the like using the light absorbing composition according to the present invention. it can.
• Such a semiconductor electrode forms a semiconductor layer on a part or the whole of an electrically conductive transparent electrode formed in a desired shape according to the application, for example, a plate shape, a column shape, a prism shape, a net shape, or the like.
• it can be obtained by adsorbing the light absorbing composition according to the present invention on the semiconductor layer.
• the transparent electrode is not particularly limited as long as it has electrical conductivity, and is, for example, glass, ceramic or plastic which is substantially transparent in a desired wavelength region from the ultraviolet region to the infrared region.
• a substantially transparent semiconductor such as tin oxide (NESA) containing a small amount of fluorine or antimony, indium oxide (ITO) containing a small amount of tin, zinc oxide, or the like is applied to the substrate by a thin film.
• tin oxide containing a small amount of fluorine or antimony
• ITO indium oxide
• a thin film of tin oxide containing a small amount of fluorine is particularly preferable.
• Such a semiconductor layer usually contains a semiconductor nanoparticle having a porous structure with an average particle diameter of 5 to 500 nm in an amount of 0.1 to 100 ⁇ m, preferably to an electrically conductive transparent electrode, by a general-purpose method. Can be formed by attaching to a thickness of 1 to 50 ⁇ m and then sintering.
• semiconductors constituting the semiconductor layer include compound semiconductors generally used in the art, especially cerium oxide, titanium oxide, zirconium oxide, vanadium oxide, niobium oxide, tungsten oxide, iron oxide, nickel oxide, and indium oxide.
• Metal oxides such as tin, tin oxide and bismuth oxide; composite metal oxides such as strontium titanate, barium titanate, potassium niobate and sodium tantalate; and metal halogens such as silver iodide, copper iodide and copper bromide
• metal sulfides such as zinc sulfide, titanium sulfide, indium sulfide, bismuth sulfide, cadmium sulfide, zirconium sulfide, tantalum sulfide, silver sulfide, copper sulfide, tin sulfide, tungsten sulfide, molybdenum sulfide, cadmium selenide, selenide Zirconium, zinc selenide, titanium selenide, Examples include chalcogenide compounds such as indium, tungsten, selenide, molybdenum selenide, bismuth selenide, c
• Japanese Patent Application Laid-Open No. 2001-357899 by the same applicant Japanese Patent Application No. 2000-111331, entitled “Semiconductor Layer, Solar Cell Using the Same, and Method for Manufacturing the Same”
• the compound semiconductor comprising a group of semiconductor particles having a plurality of peaks in the particle size distribution described in “Usage”
• the semiconductors used in the present invention should not be limited to these, and may be appropriately selected from p-type semiconductors and n-type semiconductors without departing from the purpose of the invention. What is necessary is just to choose.
• the light-absorbing composition according to the present invention is adjusted so that the concentration is from 0.1 mM to a saturation concentration, preferably from 0.1 to 0.5 mM.
• the solution may be appropriately dissolved in a solvent, and the semiconductor electrode may be immersed in the solution, and adsorbed by standing at ambient temperature or a temperature higher than ambient temperature for at least 1 minute, preferably 12 to 48 hours.
• the solvent is not particularly limited as long as the light-absorbing composition dissolves.
• the semiconductor electrode sensed by the light absorbing composition of the present invention is extremely useful as a semiconductor electrode in a photoelectric conversion element.
• the present invention also provides a photoelectric conversion element using the light-absorbing composition.
• the photoelectric conversion element according to the present invention is preferably a semiconductor electrode sensed by the light-absorbing composition, It comprises a counter electrode and a redox electrolyte in contact with those electrodes.
• FIG. 1 is a schematic view showing an example of a photoelectric conversion element according to the present invention.
• reference numeral 1 denotes a semiconductor electrode, and as described above, a part or the whole of the transparent electrode 2a is formed of a compound semiconductor or the like. After the semiconductor is deposited in a layer, it can be obtained by adsorbing the light absorbing composition to the semiconductor layer 3 and sensing the composition.
• Reference numeral 4 denotes a counter electrode, which is, for example, vacuum deposition, chemical vapor deposition, sputtering, atomic layer epitaxy, coating, and immersion on a part or the whole of the electrically conductive transparent electrode 2b as in the semiconductor electrode 1.
• Metal such as iron, ruthenium, cobalt, rhodium, nickel, platinum, copper, silver, gold, zinc, aluminum, tin, or the same as for carbon or semiconductor electrode 1. Can be obtained by adhering the above semiconductor in a layer having an appropriate thickness.
• Reference numeral 5 denotes a redox electrolyte which gives a redox system such as an iodine redox system, an iron redox system, a tin redox system, a chromium redox system, a vanadium redox system, a sulfide ion redox system, and an anthraquinone redox system.
• a redox system such as an iodine redox system, an iron redox system, a tin redox system, a chromium redox system, a vanadium redox system, a sulfide ion redox system, and an anthraquinone redox system.
• an iodine compound and an iodine compound such as an imidazolium iodide derivative, lithium iodide, potassium iodide, a trialkylammonium iodide salt, an imidazolium bromide derivative, lithium bromide, potassium bromide,
• a mixture of bromine and a bromine compound such as a sodium alkylammonium bromide salt is blended as a redox electrolyte.
• the solvent in the redox electrolyte 5 is not particularly limited as long as it is easy to handle, stable, and substantially dissolves the redox electrolyte.
• a solvent include, for example, acetonitrile, methoxyacetonitrile, Nitriles such as propionitrile, methoxypropionitrile, succinonitrile, esters such as ethylene carbonate and propylene carbonate, N, N-dimethylformamide, N, N-dimethylacetamide, hexamethylphosphoric acid triamide, etc.
• ethers such as tetrahydrofuran, tetrahydropyran, 1,4-dioxane, dicyclohexyl-18-crown-16, amines such as pyridine, nitro compounds such as nitromethane, and sulfur-containing compounds such as dimethyl sulfoxide. These are used, if necessary, in appropriate combination.
• the redox electrolyte in the photoelectric conversion element according to the present invention should not be limited to a liquid electrolyte, and even if a quasi-solid electrolyte gelled by a gelling agent is added to the electrolyte, the electrolyte is replaced with the electrolyte.
• a solid electrolyte made of a polymer such as a polyethylene oxide derivative may be used.
• the photoelectric conversion element according to the present invention does not prevent provision of a spacer for preventing physical contact between the semiconductor electrode 1 and the counter electrode 4 as necessary.
• the material of the spacer include plastics such as polyester, polycarbonate, polysulfone, polymethyl phenol, polypropylene, and polyethylene, quartz glass, soda-lime glass, aluminosilicate glass, and aluminoborosilicate glass.
• non-electrically conductive materials such as glass such as borosilicate glass, barium silicate glass, and barium borosilicate glass, and ceramics such as quartz and ceramics.
• it is formed in a film shape, a film shape or a sheet shape of 10 to 50 j m.
• the spacer can be omitted.
• the photoelectric conversion device when light hz / enters the semiconductor electrode 1, the first organic compound FZF on the semiconductor electrode 1 absorbs the light. And the energy level E is excited to a higher F / F *.
• the excited first organic compound FZ F * absorbs
• the second organic compound SZS emits light h such as fluorescence or phosphorescence having a longer wavelength than the light, and the second organic compound SZS absorbs the light emission h ⁇ and is excited to become SZS *.
• the excited electrons e in the excited second organic compound SZS * are injected into the conduction band level of the semiconductor layer 3, move through the semiconductor electrode 1, and reach the transparent electrode 2a as a back contact.
• the second organic compound SZS which has lost the electron e receives the electron e from a redox ion RZR such as an I ion in the redox electrolyte solution 5 and is reduced.
• the counter ion in the redox ion such as the I 3 — ion is reduced again on the counter electrode 4 to regenerate the iodine ion. Due to such a flow of the electrons e, an electromotive force V is generated between the transparent electrode 2 a and the counter electrode 4, and a current is applied to the external load 6.
• the light-absorbing composition of the present invention excites a light-emitting organic compound with light in the ultraviolet region to the visible region, and absorbs light emitted from the light-emitting organic compound in the excited state into the light-absorbing organic compound, thereby obtaining the latter. It is based on the finding that the light absorbing ability of a light-absorbing organic compound can be extended as if the light-absorbing organic compound had spread to a wavelength region where the light-absorbing organic compound originally does not absorb light. In the photoelectric conversion device of the present invention in which such a light-absorbing composition is used as a photosensitizer, the light-absorbing organic compound alone cannot be effectively used, for example, it is easy to use light in the ultraviolet region or near-ultraviolet region. As a result, the photoelectric conversion efficiency of the photoelectric conversion element is significantly improved.
• the light-absorbing composition of the present invention further includes a material for polymerizing the polymerizable compound by exposing the polymerizable compound to visible light, a color of an optical filter. It has a wide variety of uses as a material for adjusting the degree and also for dyeing various types of clothing. Examples include gas lasers such as argon ion lasers and krypton ion lasers, semiconductor lasers such as CdS lasers, and solid state lasers such as distributed feedback or distributed Bragg reflection Cd-YAG lasers.
• gas lasers such as argon ion lasers and krypton ion lasers
• semiconductor lasers such as CdS lasers
• solid state lasers such as distributed feedback or distributed Bragg reflection Cd-YAG lasers.
• the light-absorbing composition of the present invention having an absorption region close to the oscillation line (400 to 550 nm) of a general-purpose laser can be used as a photosensitizer in a photopolymerizable composition using such a laser as an exposure light source. It can be used very advantageously in the fields of information recording such as machines and printers, the fields of printing such as flexo plate making and gravure printing, and the fields of printed circuits such as photoresists.
• one or more other light-absorbing materials that absorb light in an ultraviolet region, a visible region, or an infrared region are appropriately blended with the first and second organic compounds, if necessary.
• the light-absorbing composition may be used for general clothing and clothing other than clothing, for example, drapes, laces, casements, prints, venetian blinds, roll screens, shutters, goodwill, blankets, futons, futons, futon covers, futon cotton, cloth ⁇ , cushions, pillows, pillowcases, cushions, mats, carpets, sleeping bags, tents, vehicle interior materials including vehicles, windshields, window glazing, etc.
• Health products such as lownets, shoe insoles, satin lining, pure grounds, furoshiki, umbrellas, umbrellas, stuffed animals, lighting equipment, for example, CRT displays, liquids Filters, panels and screens for information display devices such as television receivers and personal computers using displays, electroluminescent displays, plasma displays, etc., sunglasses, sunroofs, sun visors, PET pots, storage, vinyl When used in house windows, cold gauze, optical fibers, prepaid cards, microwave ovens, ovens, and other viewing windows, as well as packaging materials for packing, filling or containing these materials, filling materials, containers, etc.
• the light absorbing composition of this example is useful as a material for photosensitizing a semiconductor electrode in a photoelectric conversion element such as a solar cell, or a material for photosensitizing a polymerizable compound in photochemical polymerization.
• a photoelectric conversion element such as a solar cell
• a material for photosensitizing a polymerizable compound in photochemical polymerization is useful as a material for photosensitizing a semiconductor electrode in a photoelectric conversion element such as a solar cell, or a material for photosensitizing a polymerizable compound in photochemical polymerization.
• Example 2 ⁇ Absorptive composition>
• the light absorbing composition of this example is useful as a material for photosensitizing a semiconductor electrode in a photoelectric conversion element such as a solar cell or a material for photosensitizing a polymerizable compound in photochemical polymerization.
• a photoelectric conversion element such as a solar cell
• a material for photosensitizing a polymerizable compound in photochemical polymerization e.g.
• the light absorbing composition of this example is useful as a material for photosensitizing a semiconductor electrode in a photoelectric conversion element such as a solar cell, a material for photosensitizing a polymerizable compound in photochemical polymerization, and the like.
• a photoelectric conversion element such as a solar cell
• a material for photosensitizing a polymerizable compound in photochemical polymerization and the like.
• the light absorbing composition of this example is useful as a material for photosensitizing a semiconductor electrode in a photoelectric conversion element such as a solar cell, or a material for photosensitizing a polymerizable compound in photochemical polymerization.
• a photoelectric conversion element such as a solar cell
• a material for photosensitizing a polymerizable compound in photochemical polymerization is useful as a material for photosensitizing a semiconductor electrode in a photoelectric conversion element such as a solar cell, or a material for photosensitizing a polymerizable compound in photochemical polymerization.
• the four types of light absorbing compositions obtained by the methods of Examples 1 to 4 were uniformly mixed at a weight ratio of 1: 3: 2: 1, respectively, and sensitized to light in the ultraviolet region to the red region. A light-absorbing composition exhibiting performance was obtained.
• the light absorbing composition of this example is useful as a material for sensing a semiconductor electrode in a photoelectric conversion element such as a solar cell, or a material for photosensitizing a freely synthesized compound in photochemical polymerization.
• a photoelectric conversion element such as a solar cell
• a material for photosensitizing a freely synthesized compound in photochemical polymerization is useful as a material for sensing a semiconductor electrode in a photoelectric conversion element such as a solar cell, or a material for photosensitizing a freely synthesized compound in photochemical polymerization.
• Example 6 ⁇ Semiconductor electrode>
• a titanium oxide nanoparticle having an average particle diameter of 23 nm and a titanium oxide nanoparticle having an average particle diameter of 12 nm were mixed at a weight ratio of 4: 1, and dispersed in a 20% (w / w) aqueous solution of polyethylene glycol. After that, it was applied to one side of a general-purpose glass substrate having electrical conductivity in a thickness of about 10 m, dried, and baked at 450 ° C for 30 minutes to obtain a semiconductor electrode.
• the absorbance composition obtained by the method of Example 1 the concentration of total organic compounds were dissolved in ethanol so that the 1 X 10 one 4 M.
• the solution obtained above is added to this solution.
• the body electrode was immersed, allowed to stand at room temperature for 12 hours, taken out of the solution, and dried to obtain a semiconductor electrode sensitized by the light absorbing agent of the present invention.
• the semiconductor electrode of this example is extremely useful, for example, as a semiconductor electrode constituting a photoelectric conversion element such as a photoelectrochemical solar cell.
• a photoelectric conversion element such as a photoelectrochemical solar cell.
• Example 7 Photoelectric conversion element>
• a general-purpose ionomer resin trade name "Himilan", manufactured by DuPont-Mitsui Polychemical Co., Ltd.
• the photoelectric conversion characteristics of the photoelectric conversion device obtained by the method of Example 7 were examined in accordance with a conventional method.
• the light source used was a general-purpose solar simulator (air mass 1.5, illuminance 94, 500lux, radiant energy density 82mWZcm 2 ) combining a xenon lamp and a bandpass filter.
• the photoelectric conversion characteristics of the photoelectric conversion device manufactured in the same manner except that the organometallic complex represented by Chemical Formula 1 was omitted were examined in the same manner as described above. Table 1 shows the results. Table 1: Short-circuit current Maximum output Photoelectric conversion efficiency
• the photoelectric conversion device has a short-circuit current density and a photoelectric conversion efficiency that are comparable to those of the control in which the organometallic complex represented by Chemical Formula 1 is omitted. It surpassed photoelectric conversion elements. That is, the short-circuit current and photoelectric conversion efficiency of the control of the photoelectric conversion element, respectively, 7. 3mAZcm 2 and 1.
• the short-circuit current and the photoelectric conversion efficiency of the photoelectric conversion device according to the present invention were 7.8 mAZcm 2 and 1.6%, respectively, which were lower than those of the control photoelectric conversion device. It was significantly higher.
• the maximum output of the photoelectric conversion element according to the present invention was 1.6 mWZcm 2, which was 1.2 times higher than the maximum output of the control photoelectric conversion element, 1.3 mW cm 2 .
• the organic compounds represented by Chemical Formula 1 and Chemical Formula 2 have an absorption region and a light emission region as shown in FIG.
• the organic compound represented by Chemical Formula 1 is excited when irradiated with light in the ultraviolet region or the ultraviolet region around the wavelength of 346 r ⁇ m, which is the absorption maximum wavelength thereof, and emits fluorescence in an orange region around the wavelength of 613 nm.
• the emission range of the organic compound represented by the chemical formula 1 overlaps with the absorption range of the organic compound represented by the chemical formula 2.
• the luminescence of the organic compound represented by the formula is substantially absorbed by the organic compound represented by the chemical formula 2.
• the organic compound represented by Chemical Formula 2 directly absorbs the component.
• the absorption peaks and emission peaks in FIG. 2 are schematically shown to explain the energy transfer between organic compounds. It does not accurately reflect the intensity of absorption or emission.
• Photoelectric conversion devices were produced in the same manner as in Examples 6 and 7, except that the light absorbing composition obtained by the method of Example 5 was used instead of the light absorbing composition obtained by the method of Example 1.
• the photoelectric conversion element of this example having excellent photoelectric conversion efficiency is extremely useful as a basic element of a photoelectrochemical solar cell. Industrial applicability
• the light-absorbing composition of the present invention excites a light-emitting organic compound with light in the ultraviolet region to the visible region, and causes the light-emitting organic compound to absorb light emitted from the light-emitting organic compound in the excited state. This is based on the finding that the light absorbing ability of the latter light-absorbing organic compound can be extended as if the light-absorbing organic compound extended to a wavelength range where the light-absorbing organic compound originally does not absorb light.
• the light-absorbing composition of the present invention which uses such a combination of the light-emitting organic compound and the light-absorbing organic compound, can absorb light in a desired wavelength region from the ultraviolet region to the visible region, and thus has a photosensitizing ability.
• the light-absorbing composition of the present invention which has an excellent affinity for semiconductors, cannot be effectively used alone with a light-absorbing organic compound when used in a solar cell, especially a photoelectric conversion element such as a photoelectrochemical solar cell.
• a photoelectric conversion element such as a photoelectrochemical solar cell.
• the photoelectric conversion efficiency of the photoelectric conversion element is significantly improved. This invention having such remarkable effects can be said to be a significant invention that greatly contributes to the art.

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