JPH0145629B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to an electrophotographic photoreceptor, and more particularly to an electrophotographic photoreceptor having a carrier transport layer combined with a layer of material that absorbs light and generates carriers. In recent years, in the electrophotography industry, a carrier generation layer containing a substance that absorbs visible light and generates charged carriers, and a carrier transport layer that transports either or both of the positively and negatively charged carriers generated in this carrier generation layer. It has been proposed that the photosensitive layer of an electrophotographic photoreceptor be constructed by combining the following. In this way, the generation of charged carriers and
By assigning the two basic functions of transport in the photosensitive layer to separate substances or substance systems, the range of substances that can be used in the composition of the photosensitive layer is widened, and the substance or substance system that optimally fulfills each function. This makes it possible to independently select the characteristics required in the electrophotographic process, such as high surface potential when charged, high charge retention, high surface strength, and photosensitivity. It becomes possible to construct a photosensitive layer with excellent properties such as high viscosity and high stability during repeated use. Conventionally, as such a photosensitive layer, the following ones are known, for example. (1) A carrier generation layer made of amorphous selenium or cadmium sulfide and a carrier transport layer made of poly-N-vinylcarbazole are laminated. (2) A carrier generation layer made of amorphous selenium or cadmium sulfide, and 2,4,7-trinitro-9
- laminated with a carrier transport layer containing fluorenone. (3) a carrier generation layer made of a perylene derivative;
A carrier transport layer containing an oxadiazole derivative (U.S. Patent No.
3871882). (4) A layer in which a carrier generation layer made of chlordiane blue or methylscalyllium and a carrier transport layer containing a pyrazoline derivative are laminated (see JP-A-51-90827). (5) A carrier generation layer made of amorphous selenium or its alloy and a carrier transport layer containing a polyarylalkane aromatic amino compound are laminated (Japanese Patent Application No. 147251/1982). (6) A layer in which a carrier generation layer containing a perylene derivative and a carrier transport layer containing a polyarylalkane aromatic amino compound are laminated (Japanese Patent Application No. 19907/1983). As described above, many types of photosensitive layers are known, but in many conventional electrophotographic photoreceptors having such photosensitive layers, the photosensitive layer changes when repeatedly subjected to electrophotographic processes. It has the disadvantage of severe electrical fatigue and a very short service life. That is, 1
Although it is necessary to eliminate the charge in the photosensitive layer when one electrophotographic process is completed and the photosensitive layer is used for the next electrophotographic process, the discharge rate at the final stage of discharge is extremely low in this type of photosensitive layer. Therefore, even if the static electricity is removed by exposure to a large amount of light, it is impossible to completely eliminate the static electricity, and a fairly high residual potential remains.Moreover, this residual potential increases cumulatively each time the electrophotographic process is repeated. Eventually, due to a small number of continuous copies, the residual potential exceeds its permissible limit and the electrophotographic photoreceptor becomes unusable. It is certainly possible to restore some types of photoreceptors to a usable state, but in order to recover, it is necessary to leave the photoreceptor in a dormant state for a considerable period of time, or to perform appropriate heat treatment. Moreover, it is not possible to restore the residual potential to a sufficiently lowered state, and therefore, the number of consecutive copies possible before the next unusable state is reached is greatly reduced. In addition to the above, among conventional photoreceptors of this type, those containing a polyarylalkane aromatic amino compound in the carrier transport layer are subject to significant deterioration of the photosensitive layer by light, especially ultraviolet light. However, it also has the disadvantage that its service life is kept low. The present invention eliminates the above-mentioned drawbacks and has a very long service life and a particularly long continuous service life due to almost no electrical fatigue caused by the electrophotographic process. It is equipped with a photosensitive layer that has the characteristic of reducing the potential to an extremely low state that causes no practical problems, and therefore allows continuous reproduction many times without performing a recovery operation. An electrophotographic photoreceptor that is stable against oxidizing active species generated by temperature, temperature, and corona discharge, and has high mechanical strength and can stably perform its functions over a long period of time in these respects. The purpose is to provide In order to achieve the above objectives, the present invention has been completed as a result of intensive research. The present invention relates to an electrophotographic photoreceptor comprising a photosensitive layer formed of a laminate of a carrier generation layer and a carrier transport layer provided on a conductive support, and an amine derivative represented by the following general formula [A] and an amine derivative represented by the following general formula [ This is an electrophotographic photoreceptor characterized by containing a carbazole derivative represented by B] as a carrier transport substance. General formula [A]: [In the formula, Ar ₁ , Ar ₂ and Ar ₃ represent a substituted or unsubstituted aromatic carbocyclic group and a substituted or unsubstituted aromatic heterocyclic group. ] Furthermore, as Ar ₁ , Ar ₂ and Ar ₃ , for example, a halogen atom, a hydroxy group, a cyano group, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted aryloxy group, or a substituted A phenyl group, naphthyl group, anthranyl group, thienyl group, or furyl group having a substituent such as an amino group is particularly effectively used. General formula [B]: [In the formula, R ₁ and R ₂ are hydrogen atoms, halogen atoms,
Each represents a substituted or unsubstituted alkyl group, alkoxy group, aryloxy group, aryl group, amino group or hydroxyl group, R ₃ and R ₄ represent a substituted or unsubstituted alkyl group or a substituted or unsubstituted aryl group, Ar represents a substituted or unsubstituted divalent carbocyclic aromatic ring, an oxygen atom, or a sulfur-containing heterocyclic aromatic ring. ] Specific representative examples of the amine derivatives useful in the present invention represented by the general formula [A] are listed below. Specific representative examples of the carbazole derivatives useful in the present invention represented by the general formula [B] are listed below. The present invention will be specifically explained below with reference to the drawings. In the present invention, as shown in FIG. 1, a carrier generation layer 2 containing a carrier generation substance described later as a main component is formed on a conductor support 1, and on this carrier generation layer 2, the carrier generation layer 2 described above is formed. A carrier transport layer 3 containing a carrier transport substance as a main component is formed by laminating the carrier transport layer 3, and the carrier generating layer 2 and the carrier transport layer 3 constitute a photosensitive layer 4. Here, as the material of the conductive support 1, for example, a sheet of metal such as aluminum, nickel, copper, zinc, palladium, silver, indium, tin, platinum, gold, stainless steel, or brass can be used. For example, as shown in FIG. 2, a conductive layer 1 is placed on an insulating substrate 1A.
The conductive support 1 can also be constructed by providing B. In this case, the substrate 1A is suitably made of paper, plastic sheet, or the like, which is flexible and has sufficient strength against stress such as bending and tension. The conductive layer 1B can also be provided by laminating metal sheets, vacuum depositing metal, or by other methods. The carrier generation layer 2 is made of a carrier generation substance described below alone, or a suitable binder resin is added thereto, or a substance having a high mobility for carriers of specific or non-specific polarity, that is, a carrier transport substance is added. It can be formed by Specific forming methods include a method in which the carrier-generating substance is vacuum-deposited on the support, and a method in which the carrier-generating substance is dissolved or dispersed in a suitable solvent and then applied and dried. In this latter method, a binder resin or a carrier transport material may be added, and in that case, the ratio of carrier generating material: binder resin: carrier transport material is 1:0 by weight.
-100:0-500, particularly preferably 1:0-10:0-50. As the carrier generating substance, any inorganic pigment or organic dye can be used as long as it absorbs visible light and generates free carriers. In addition to inorganic pigments such as amorphous selenium, trigonal selenium, selenium-arsenic alloy, selenium-tellurium alloy, cadmium sulfide, cadmium selenide, cadmium selenide sulfide, mercury sulfide, lead oxide, lead sulfide, the following representative examples Organic dyes such as those shown in may also be used. (1) Azo dyes such as monoazo dyes, polyazo dyes, metal complex azo dyes, pyrazolone azo dyes, stilbene azo dyes, and thiazole azo dyes (2) Perylene dyes such as perylenic anhydride and perylenic acid imide (3) Anthraquinone Anthraquinone or polycyclic quinone dyes such as derivatives, anthorone derivatives, dibenzpyrenequinone derivatives, pyranthrone derivatives, violanthrone derivatives and isoviolanthrone derivatives (4) Indigoid dyes such as indigo derivatives and thioindigo derivatives (5) Metals Phthalocyanine dyes such as phthalocyanine and metal-free phthalocyanine (6) Carbonium dyes such as diphenylmethane dyes, triphenylmethane dyes, xanthene dyes and acridine dyes (7) Quinoneimine dyes such as azine dyes, oxazine dyes and thiazine dyes (8) Methine dyes such as cyanine dyes and azomethine dyes (9) Quinoline dyes (10) Nitro dyes (11) Nitroso dyes (12) Benzoquinone and naphthoquinone dyes (13) Naphthalimide dyes (14) Bisbenzimidazole derivatives Perinone dyes (15) Quinacridone dyes Binder resins used here include, for example, polyethylene, polypropylene, acrylic resins, methacrylic resins, vinyl chloride resins, vinyl acetate resins, epoxy resins, polyurethane resins, phenolic resins, and polyesters. Addition polymer resins such as resins, alkyd resins, polycarbonate resins, silicone resins, melamine resins, polyaddition resins, polycondensation resins, and copolymer resins containing two or more repeating units of these resins, e.g. Examples include vinyl chloride-vinyl acetate copolymer resin, vinyl chloride-vinyl acetate-maleic anhydride copolymer resin, and the like. However, the binder resin is not limited to these, and all resins commonly used for such purposes can be used. As the carrier transport substance having high mobility for carriers of specific or non-specific polarity that can be added to the carrier generation layer, the carrier transport substance used in the construction of the carrier transport layer 3 etc. in the present invention may be used as a part or whole of the carrier transport substance. However, other carrier transport materials may be used in consideration of the performance as an electrophotographic photoreceptor. Furthermore, this carrier generation layer may contain one or more electron-accepting substances for the purpose of improving sensitivity, reducing residual potential or fatigue during repeated use, etc. Examples of electron-accepting substances that can be used here include succinic anhydride, maleic anhydride,
Dibromaleic anhydride, phthalic anhydride, tetrachlorophthalic anhydride, tetrabromophthalic anhydride, 3-nitrophthalic anhydride, 4-nitrophthalic anhydride, pyromellitic anhydride, mellitic anhydride,
Tetracyanoethylene, tetracyanoquinodimethane, O-dinitrobenzene, m-dinitrobenzene, 1,3,5-trinitrobenzene, paranitrobenzonitrile, picryl chloride, quinone chlorimide, chloranil, bromanil, dichlorodicyanoparabenzoquinone , anthraquinone,
Dinitroanthraquinone, 2,7-dinitrofluorenone, 2,4,7-trinitrofluorenone, 2,4,5,7-tetranitrofluorenone, 9-fluorenylidene-[dicyanomethylenemalonodinitrile], polynitro-9-fluorenylidene- [Dicyanomethylene malonodinitrile], picric acid, O-nitrobenzoic acid, p-nitrobenzoic acid, 3,5-dinitrobenzoic acid, bentafluorobenzoic acid, 5-nitrosalicylic acid,
Examples include 3,5-dinitrosalicylic acid, phthalic acid, mellitic acid, and other compounds with high electron affinity. The addition ratio of the electron-accepting substance is carrier-generating substance:electron-accepting substance=100:0.01-200, preferably 100:0.1-100. The carrier generation layer 2 formed as described above preferably has a thickness of 0.005 to 20 microns,
Particularly preferred is 0.1 to 5 microns. Further, the carrier transport layer 3 is obtained by using a mixture of the above-mentioned amine derivative [A] and carbazole derivative [B] as a carrier transport substance, and dissolving or dispersing it in a suitable solvent together with a suitable binder resin as necessary. It can be formed by applying a coating liquid and drying it, or by other methods. The appropriate blending ratio of the amine derivative [A] and the carbazole derivative [B] is such that the carbazole derivative [B] accounts for 1 to 80 weight percent of the total carrier transport substance [A] + [B]. Particularly preferably 5% by weight or more, 50
weight percent or less. If it is less than 1% by weight, the residual potential will increase sharply during repeated use and the desired repeating stability cannot be obtained, and if it exceeds 80% by weight, the charging potential will decrease drastically during repeated uses, and the desired repeating stability will also not be obtained. Examples of binder resins that can be used in the carrier transport layer include polyethylene, polypropylene, acrylic resin, methacrylic resin, vinyl chloride resin, vinyl acetate resin, epoxy resin, polyurethane resin, phenolic resin, polyester resin, alkyd resin, polycarbonate resin, Addition polymerization resins such as silicone resins and melamine resins,
Polyaddition type resins, polycondensation type resins, and copolymer resins containing two or more of the repeating units of these resins, such as vinyl chloride-vinyl acetate copolymer resins, vinyl chloride-vinyl acetate-maleic anhydride copolymer resins, etc. Examples include polymer resins. However, binder resins are not limited to these,
All resins commonly used for such applications can be used. The blending ratio of the binder resin and the total carrier transport material is preferably 10 to 500 parts by weight per 100 parts by weight of the binder resin, and when polycarbonate is used as the binder resin, it is preferably 20 to 500 parts by weight per 100 parts by weight of the binder resin. The use of ˜200 parts by weight of total carrier transport material is preferred as it provides excellent electrophotographic properties. Further, the above-mentioned electron-accepting substance may be added to this carrier transport layer for the purpose of improving sensitivity and further reducing residual potential or fatigue during repeated use. When this electron-accepting substance is added to both the carrier generation layer and the carrier transport layer, the electron-accepting substances added to each layer may be completely or partially the same, or in some cases, they may be completely different. I don't mind. The addition ratio of the electron-accepting substance to the carrier transport layer is such that the total carrier transport substance:electron-accepting substance is 100:0.01 to 100, preferably 100:0.1 to 50, by weight. The thickness of the carrier transport layer 3 thus formed is between 2 and 100 microns, preferably between 5 and 30 microns. The electrophotographic photoreceptor of the present invention has the above-described structure, and as is clear from the Examples and Comparative Examples described later, the photosensitive layer exhibits little electrical fatigue even when subjected to continuous electrophotographic processes. Therefore, there is no cumulative increase in the residual potential that cannot be removed in the photosensitive layer 4, and therefore, a long service life is obtained, and there is no restriction on continuous copying, and the copied image is always stable and has no fog on the background. can be caused to form. Furthermore, the electrophotographic photoreceptor of the present invention is stable against deterioration factors such as photochemical reactions based on active light irradiated from exposure lamps and erasing lamps, oxidation effects due to active species generated by corona discharge, and increases in internal temperature. Since it is large, there is little change over time in characteristics such as acceptance potential, sensitivity, and residual potential in bright light, and therefore there is little natural deterioration due to use, and maintenance and handling are extremely simple. Furthermore, the carrier transport layer 3 can contain a binder resin at a relatively high concentration without impairing its good properties, thereby increasing the mechanical strength of the photosensitive layer 4. This increases resistance to mechanical damage, such as development resistance and cleaning resistance, and in this respect also extends the service life. As described above, in the present invention, by configuring the carrier transport layer 3 as described above, the electrophotographic photoreceptor of the present invention has a feature that it can maintain stable performance especially during continuous use. Although it is not clear why the electrophotographic photoreceptor of the present invention exhibits excellent characteristics, it is one of the elements of the carrier transport material used in combination with the carrier generation material to form the photosensitive layer of the photoreceptor. A carbazole derivative represented by the general formula [B] is itself a photoconductive substance that generates carriers when exposed to ultraviolet light, and the carriers generated by ultraviolet light are trapped in a layer containing a carrier transport substance. It is presumed that this is to neutralize holes and improve carrier transport efficiency. If only the carbazole derivative is used as the carrier transport substance, the carrier transport function is poor and carriers from the carrier generating substance cannot be efficiently transported. If only the amine derivative represented by the above general formula [A] is used, although the carrier transport function is excellent, it deteriorates due to active species with oxidizing effects caused by ultraviolet light, temperature, and corona discharge, resulting in repeated use. The disadvantage is that the transport function deteriorates during the process. That is, sufficient effects of the present invention are exhibited by a photosensitive layer containing a combination of the amine derivative represented by the general formula [A] and the carbazole derivative represented by the general formula [B] as a carrier transport material. The present invention has been explained above according to the specific configuration example shown in FIG. 1 or FIG. 2, but in the present invention,
It is sufficient if the above-mentioned components are contained in the carrier transport layer to be combined with the carrier generation layer, and the mechanical structure of the electrophotographic photoreceptor can be arbitrarily selected. For example, as shown in FIG.
A suitable intermediate layer 5 is provided thereon, a carrier generation layer 2 is formed thereon, and a carrier transport layer 3 is formed thereon.
may be formed. This intermediate layer 5 includes a photosensitive layer 4
It has a function of preventing free carriers from being injected from the conductive support 1 into the photosensitive layer 4 during charging, and a function as an adhesive layer that integrally adheres the photosensitive layer 4 to the conductive support. You can force it. Materials for the intermediate layer 5 include metal oxides such as aluminum oxide and indium oxide, acrylic resins, methacrylic resins, vinyl chloride resins, vinyl acetate resins, epoxy resins, polyurethane resins, phenolic resins, polyester resins, alkyd resins, Polymer materials such as polycarbonate resin, silicone resin, melamine resin, vinyl chloride-vinyl acetate copolymer resin, and vinyl chloride-vinyl acetate-maleic anhydride copolymer resin can be used. Further, as shown in FIG. 4, on the conductive support 1,
The photosensitive layer 4 may be constructed by forming the carrier transport layer 3 with or without the intermediate layer 5 and forming the carrier generation layer 2 thereon. Examples of the present invention will be described below, but the present invention is not limited thereto. Example 1 A vinyl chloride-vinyl acetate-maleic anhydride copolymer "Eslec MF-10" (Sekisui Chemical Co., Ltd.
Co., Ltd.) with a thickness ^of approximately 0.1 micron was provided, and the polycyclic quinone dye 4, 10-Dibromanthanthrone (Monolite Red 2Y CI No. 59300) was evaporated onto the intermediate layer to form a carrier generating layer approximately 0.5 microns thick. On the other hand, 11.25 g of the amine derivative shown in (A-9)
and 3.75 g of the exemplified carbazole derivative (B-13),
Polycarbonate resin “Panlite L-1250”
(manufactured by Teijin Chemicals) in 100 ml of 1,2-dichloroethane, and the resulting solution was applied onto the carrier generation layer using a doctor blade.
It was dried at .degree. C. for 1 hour to form a carrier transport layer with a thickness of 12 microns, thereby producing an electrophotographic photoreceptor (sample No. 1) of the present invention. Example 2 A carrier generation layer with a thickness of about 0.5 microns and a carrier transport layer with a thickness of 12 microns were formed in the same manner as in Example 1 except that the exemplary compound (A-8) was used as the amine derivative, and the present invention An electrophotographic photoreceptor (sample No. 2) was prepared. Example 3 Exemplified compound (B-
14) was used in the same manner as in Example 1, except that a thickness of approximately
An electrophotographic photoreceptor (Sample No. 3) of the present invention was prepared by forming a carrier generation layer of 0.5 microns and a carrier transport layer of 12 microns in thickness. Example 4 2 g of polycarbonate resin and 0.2 g of tetrabromophthalic anhydride were added to 100 ml of 1,2-dichloroethane.
4 g of 4,10-dibromanthanthrone was added to a solution dissolved in water and subjected to ultrasonic dispersion, and this dispersion was coated on a conductive support having the same intermediate layer as in Example 1 to a thickness of 1 micron. A carrier generation layer was formed. On the other hand, 11.25 g of exemplified amine derivative (A-9), 3.75 g of exemplified carbazole derivative (B-13), 0.03 g of tetrabromophthalic anhydride, and 15 g of polycarbonate resin were dissolved in 100 ml of 1,2-dichloroethane to obtain a solution. was applied onto the carrier generation layer using a doctor blade and dried at 80°C for 1 hour to form a carrier transport layer with a thickness of 12 microns, thereby producing an electrophotographic photoreceptor of the present invention (sample No. 4). did. Example 5 N,N'-dimethylperylene-3,4,9.10-tetracarboxylic acid diimide (Paliogen Maroon 3920C.I.No.71130), which is a perylene dye, was used instead of the polycyclic quinone dye in Example 1. A 0.5 micron thick carrier generation layer and a 12 micron thick carrier transport layer were formed in the same manner as in Example 1 except that a 0.5 micron thick carrier transport layer was used to form an electrophotographic photoreceptor of the present invention (sample No. 1).
5) was created. Example 6 On a conductive support made of polyethylene terephthalate with a thickness of 100 microns on which aluminum was vapor-deposited, selenium was vapor-deposited for 1 minute at an evaporation source temperature of 300°C in a vacuum atmosphere of 2 to 3 × 10 ^-5 Torr, Thickness 1
A carrier generation layer consisting of micron-sized amorphous selenium was formed. Next, the same carrier transport layer forming solution used in Example 1 was applied and vacuum dried at 40°C for 24 hours to form a carrier transport layer with a thickness of 12 microns. )It was created. Comparative Example 1 15 g of exemplified amine derivative (A-9) and 15 g of polycarbonate resin were mixed in 100 g of 1,2-dichloroethane.
ml to prepare a carrier transport layer forming solution which does not contain the carbazole derivative of the general formula [B]. This solution was applied onto the same carrier generation layer as in Example 1 to form a carrier transport layer with a thickness of 12 microns, and a comparative electrophotographic photoreceptor (comparative sample No. 1) was prepared.
1) was created. Comparative Example 2 An attempt was made to create a carrier transport layer that does not contain an amine derivative by adding 15 g of the exemplified carbazole derivative (B-13) and 15 g of polycarbonate resin to 100 ml of 1,2-dichloroethane, but the solubility of the above compound was poor and the Since quantitative dissolution was not possible, the amount was reduced to 6 g and a carrier transport layer forming solution was prepared again. This solution was applied onto the same carrier generation layer as in Example 1 to form a carrier transport layer with a thickness of 12 microns, and a comparative electrophotographic photoreceptor (comparative sample No. 1) was prepared.
2) was created. Comparative Example 3 A carrier with a thickness of 12 microns was prepared in the same manner as in Comparative Example 1, except that 0.3 g of 2,4,7-trinitro-9-fluorenone was further added when preparing the carrier transport layer forming solution in Comparative Example 1. forming a transport layer;
A comparative electrophotographic photoreceptor (comparative sample No. 3) was prepared. Comparative Example 4 Thickness was determined in the same manner as in Example 1 except that a compound represented by the following structural formula was used as a carbazole derivative.
A carrier transport layer of 12 microns was formed, and a comparative electrophotographic photoreceptor (comparative sample No. 4) was prepared. Sample No. 1~ obtained in the above Examples and Comparative Examples
No. 6 and comparative samples No. 1 to No. 4 were attached to an electrometer SP-428 type (manufactured by Kawaguchi Electric Seisakusho Co., Ltd.).
A charging operation is performed for 5 seconds with the voltage applied to the discharge electrode of the charger set to -6 KV, and the charging potential Vo (V) on the surface of the photosensitive layer immediately after this charging operation and the voltage necessary to attenuate this charging potential Vo to 1/2 are determined. The irradiation light amount E1/2 (1X·sec) was measured. The result is the first
As shown in the table.

【table】

[Table] Also, the above samples No. 1 to No. 6 and comparative samples No. 1 to No.
4 was attached to a dry type electronic copying machine U-Bix 2000R (manufactured by Konishiroku Photo Industry Co., Ltd.) for continuous copying, and the black paper potential Vb (v) and white paper potential at an exposure aperture value of 2.5 were measured.
Vw (v) was measured before development using an electrostatic voltmeter model 144D-1D (manufactured by Monroe Electronics Inc.). The results are shown in Table 2. The black paper potential here refers to the surface potential of the photoreceptor when the above copying cycle is performed using black paper with a reflection density of 1.3 as the original, and the white paper potential refers to the surface potential of the photoreceptor when the original is a blank paper. Represents electric potential.

[Table] represents a decrease.
The results in Table 2 show that all of the sample photoreceptors are stable with little variation in both potential after 5000 copies compared to the initial black paper potential and white paper potential, but comparative sample No.
Photoconductors No. 1, No. 3, and No. 4 all had a sharp increase in both potentials, especially the rise in white paper potential, which caused background fog in the copied image, while comparative sample No. 2 photoconductor caused background fog due to a decrease in black paper potential. It is understood that the image density is significantly reduced.

[Brief explanation of drawings]

FIG. 1 is an explanatory enlarged cross-sectional view showing an example of the structure of the electrophotographic photoreceptor of the present invention, FIG. 2 is an explanatory enlarged cross-sectional view showing another structure example of the present invention, and FIGS.
Each figure is an explanatory enlarged sectional view showing still another configuration example of the present invention. 1... Conductive support, 2... Carrier generation layer,
3... Carrier transport layer, 4... Photosensitive layer, 5... Intermediate layer, 1A... Support, 1B... Conductive layer.

Claims (1)

[Scope of Claims] 1. An electrophotographic photoreceptor comprising a photosensitive layer consisting of a laminate of a carrier generation layer and a carrier transport layer provided on a conductive support, comprising an amine derivative represented by the following general formula [A] and the following: An electrophotographic photoreceptor comprising a carbazole derivative represented by the general formula [B]. General formula [A]: [In the formula, Ar ₁ , Ar ₂ and Ar ₃ represent a substituted or unsubstituted aromatic carbocyclic group and a substituted or unsubstituted aromatic heterocyclic group. ] General formula [B]: [In the formula, R ₁ and R ₂ are hydrogen atoms, halogen atoms,
Each represents a substituted or unsubstituted alkyl group, alkoxy group, aryloxy group, aryl group, amino group or hydroxyl group, R ₃ and R ₄ represent a substituted or unsubstituted alkyl group or a substituted or unsubstituted aryl group, Ar represents a substituted or unsubstituted divalent carbocyclic aromatic ring, an oxygen atom, or a sulfur-containing heterocyclic aromatic ring. 2. The electrophotographic photoreceptor according to claim 1, wherein at least one of the carrier generation layer and the carrier transport layer contains an electron-accepting substance.