Abstract: Provided is a method for recovering and reusing an active material from a positive electrode scrap.

Abstract: The present invention relates to a phosphine precursor for the preparation of a quantum dot, and a quantum dot prepared therefrom. Using the phosphine precursor for the preparation of a quantum dot of the present invention, a quantum dot with improved luminous efficiency and higher luminous color purity can be provided.

Abstract: The present disclosure relates to an organic electroluminescent device. The organic electroluminescent device of the present disclosure shows high luminous efficiency and good lifespan by comprising a specific combination of the plural kinds of host compounds and a specific hole transport compound.

Abstract: A low-power sense amplifier for a memory is provided, which includes a differential amplifier for sensing and amplifying a weak voltage signal of a bit line connected to a memory cell, and a latch amplifier for storing data inputted thereto, the latch amplifier being operated by the output signal of the differential amplifier, the sense amplifier including a bias means constructed of transistors which are included in the differential amplifier and turned on or turned off by a control signal, the transistors providing a load resistor component required for driving the differential amplifier when it is turned on, and a cutoff means for turning off the transistors constructing the bias means to stop the operation of the differential amplifier when there is a first logic state signal among the output signals of the latch amplifier. Accordingly, the low-power sense amplifier for a memory can perform high-speed sense amplification of bit line signal and prevent unnecessary power consumption.