Abstract: The present invention relates to novel quinoxaline derivatives and their use in an organic light-emitting diode device. The quinoxaline derivative is of luminescence and rigidity, can increase glass transition temperature (Tg) and has better thermal stability, and thus can be used as a hole transporting layer, a host or guest of an emitting layer or an electron transporting layer of an organic light-emitting diode device.

Abstract: A safety lighter comprises a main body having a sealed pressurized storage chamber for storing fuel for supplying the fuel; a fuel spraying head protrudes from the pressurized storage chamber for opening and closing the pressurized storage chamber; wherein in a first position of the fuel spraying head, the pressurized storage chamber is opened for spraying fuel; when in a second position of the fuel spraying head, the pressurized storage chamber is closed; a fuel supply device installed in the main body; the fuel supply device being capable of inserting into the pressurized storage chamber; a manual igniter installed aside a spraying head of the fuel supply device; and a far end control device installed at or near a bottom of the main body; for controlling the position of the fuel spraying head so as to open or close the fuel supply device.

Abstract: Structure of a wide voltage operation regime double heterojunction bipolar transistor, specifically a modified InGaP/GaAs double heterojunction bipolar transistor featuring a very broad collector-emitter voltage operation range, an invention of high speed, low power consumption and high breakdown voltage rated microwave power transistor. Unique in the incorporation of In.sub.0.49 Ga.sub.0.51 P collector layer, GaAs delta-doping sheet and undoped GaAs spacer in the collector zone. The introduction of a spacer with a delta doping sheet into the effective base-collector heterojunction serves to eliminate potential spike from appearing at base-collector interfacing any more, thus effectively precludes electron blocking effect. In the emitter zone the inventive design comprises a five-period In.sub.0.49 Ga.sub.0.