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Tsukuba, Japan

Patent
Hodogaya Chemical Co. | Date: 2014-05-19

An organic electroluminescent (EL) device having high efficiency, low driving voltage and a long lifetime is provided by combining various materials for an organic EL device, which are excellent, as materials for an organic EL device having high efficiency and high durability, in hole and electron injection/transport performances, electron blocking ability, stability in a thin-film state and durability, so as to allow the respective materials to effectively reveal their characteristics. In the organic EL device having at least an anode, a hole injection layer, a first hole transport layer, a second hole transport layer, a light emitting layer, an electron transport layer and a cathode in this order, the second hole transport layer includes an arylamine compound represented by the following general formula (1).


Patent
Hodogaya Chemical Co. | Date: 2014-06-04

According to the present invention, there are provided an indenoindole derivative represented by the following general formula (1); and an organic electroluminescent element including a pair of electrodes and at least one organic layer sandwiched therebetween, wherein the above compound is used as a constituent material for the at least one organic layer. The indenoindole derivative of the present invention provides an organic compound, which is excellent in hole injection/transport performance, has electron blocking capability, is highly stable in a thin film state, and excels in heat resistance, as a material for a high efficiency, high durability organic electroluminescent element. An organic electroluminescent element formed using this compound is highly efficient and highly durable.


Patent
Hodogaya Chemical Co. | Date: 2014-01-24

To provide a charge controlling agent for electrophotography, which presents sufficient triboelectric chargeability to a toner, is useful particularly for a color toner and further for a polymerized toner, increases a charge rising rate, has a high electric charge amount, is excellent in charging characteristics, stability over time and environmental stability and yet is safe without posing any problem regarding waste regulations, and a negatively chargeable toner for developing an electrostatic image, which uses such a charge controlling agent and which has a high charging performance. A charge controlling agent comprising, as an effective component, at least one type of cyclic phenol sulfide represented by the following formula (1), and a toner comprising such a charge controlling agent:


There is provided an organic compound having excellent characteristics, including excellent electron-injecting/transporting performance, hole blocking ability, and high stability in the thin-film state, for use as material of an organic electroluminescent device having high efficiency and high durability. There is also provided a high-efficient and high-durable organic electroluminescent device using the compound. The compound is represented by general formula (1) having a substituted anthracene ring structure and a pyridoindole ring structure. The organic electroluminescent device includes a pair of electrodes, and one or more organic layers sandwiched between the pair of electrodes, and the compound is used as a constituent material of at least one organic layer.


Patent
Hodogaya Chemical Co. | Date: 2014-02-20

Naphthotriazole derivatives represented by the following general formula (1), wherein, Ar

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