Electrophotographic receptor having excellent charging characteristic, photosensitivity, and residual potential

An electrophotographic receptor comprising:

• a conductive support;
• an
• a photoconductor layer formed on said conductive support and constituted by a charge generating layer containing a charge generating substance and a charge transporting layer containing a charge transporting substance,
• wherein a minimum electric field strength required for a waveform, which indicates a change in photocurrent generated when a voltage is applied to and a light pulse is radiated on said photoconductive layer with respect to a time, to have a single peak and an upwardly projecting shape is not more than 200 kv/cm, and said charge transporting substance is a compound represented by the following formula:
• ##STR37## wherein each of R.sub.2 and R.sub.3 represents --O--R.sub.4 (wherein R.sub.4 represents an alkyl group which may be substituted, an aralkyl group, an aryl group, or a heterocyclic group), ##STR38## (wherein each of R.sub.5 and R.sub.6 represents an alkyl group which may be substituted, an aralkyl group, or an aryl group, or R.sub.5 and R.sub.6 together form an N-containing heterocyclic ring), or hydrogen, when neither R.sub.2 nor R.sub.3 is hydrogen, n=1, at least one of R.sub.2 and R.sub.3 is ##STR39## and neither R.sub.2 nor R.sub.3 is not less than two ##STR40## R.sub.1 represents an alkyl group in which C.gtoreq.3 and which may be substituted, --O--R.sub.7 (wherein R.sub.7 represents an alkyl group in which C.gtoreq.3 and which may be substituted, an aralkyl group, a heterocyclic group, or hydrogen), or a halogen;
• when neither R.sub.2 nor R.sub.3 is hydrogen, n=1, and at least one of R.sub.2 and R.sub.3 is not less than two ##STR41## or neither R.sub.2 nor R.sub.3 is ##STR42## R.sub.1 represents an alkyl group in which C.gtoreq.2 and which may be substituted, --O--R.sub.7, or hydrogen, when neither R.sub.2 nor R.sub.3 is hydrogen and n.gtoreq.2, R.sub.1 represents an alkyl group which may be substituted, an alkyl group, --O--R.sub.8 (wherein R.sub.8 represents an alkyl group which may be substituted, an aralkyl group, an aryl group, a heterocyclic group, or hydrogen), or a halogen, n=1, to 5, m=1 to 5, and l=1 to 5.