Abstract: Provided is a cooking utensil for cooking by variously combining multi-structured composite bases according to a user's selection. The cooking utensil includes: a base portion made of a composite material and formed to have different thermal conductivities of a heat source according to cooking ingredients and cooking methods; a body portion into which the cooking ingredients are put and to which the base portion is detachably coupled; and a lid configured to seal an upper part of the body portion.

Abstract: The present disclosure relates to a producing method for oxynitride or nitride phosphor powders which can be used in displays such as vacuum fluorescent display (VFD), field emission display (FED) and LED display devices, or in lighting devices such as cold cathode fluorescent lamps (CCFL) and LED lamps, or in light-emitting apparatuses such as back-lights, wherein the producing method for phosphor powders comprises the step of subjecting part or all of a metal oxide to nitriding by calcining in an atmosphere containing nitrogen, using a fine carbon substance.

Abstract: Disclosed is a thulium-containing fluorescent substance for a white light emitting diode represented by a following chemical formula 1, (Chemical Formula 1) (M1-X-J7EuxTnIy)2SiO4 where M is a divalent cation metal including Sr or Ba, with 0.005<x<0.05 and 0.005<y<0.05. The silicate-based yellow fluorescent substance according to the present invention is sufficiently excited by a blue light source generated by a blue LED to exhibit a yellow emission, with superior luminous intensity, due to the addition of europium oxide (Eu2O3) and thulium oxide (Tm2O3) as an activator, thereby being suitable for a white LED.

Abstract: Disclosed is a thulium-containing fluorescent substance for a white light emitting diode represented by a following chemical formula 1, (Chemical Formula 1) (M1-X-J7EuxTnIy)2SiO4 where M is a divalent cation metal including Sr or Ba, with 0.005<x<0.05 and 0.005<y<0.05. The silicate-based yellow fluorescent substance according to the present invention is sufficiently excited by a blue light source generated by a blue LED to exhibit a yellow emission, with superior luminous intensity, due to the addition of europium oxide (Eu2O3) and thulium oxide (Tm2O3) as an activator, thereby being suitable for a white LED.