Abstract:
The present invention relates to a novel bromosilicate-based phosphor for near-ultraviolet excitation, a method of preparing the same, and a light-emitting device using the same. Particularly, the present invention relates to (Ca_3_-x,Eu_x)SiO_4Br_2 phosphor, (Ca_3-x-yMg_yEu_x)SiO_4Br_2 phosphor, (Ca_3_-x-_yMg_yEu_x_)SiO_4(Br_2_-_zD_z) phosphor, a method of preparing the same, and a light-emitting device using the same. The phosphor according to the present invention absorbs lights in 250-450 nm in a near-ultraviolet region having high excitation efficiency, emits lights in 450-750 nm in a whole visible region, and exhibits high emission luminance, and may be usefully used as a phosphor of a light-emitting device for near-ultraviolet excitation. Particularly, the phosphor of the present invention may be usefully used as a phosphor of a white emitting diode for near-ultraviolet excitation.
Abstract:
The present invention relates to a manufacturing method of an electrode active material using a porous silica support and an electrode active material manufactured thereby. Specifically, the present invention provides a manufacturing method of an electrode active material using a porous silica support, which comprises a step of adding a lithium precursor, a manganese precursor, a chelating agent, a polymerizing agent and an reducing agent in a solvent, and mixing (step 1); a step of adding and mixing a porous silica support in the mixture of step 1, and reacting (step 2); and a step of thermally processing the product of step 2 in a reduction condition. The manufacturing method according to the present invention can manufacture a silicate-based manganese lithium compound, which can be used as an electrode active material. When the silicate-based manganese lithium compound manufactured according to the present invention is used as an electrode active material, it has an effect of showing an excellent property in the initial capacity in comparison with the silicate-based manganese lithium compound manufactured by using existing general silica materials. Also, the silicate-based manganese lithium compound manufactured according to the present invention does not require post-treatment processes such as carbon coating, hetero-element doping, ball milling, etc., and, therefore, providing advantages capable of manufacturing an electrode active material for a lithium secondary battery at low costs.
Abstract:
본 발명은 가시광 영역에서 투과도가 우수한 아연/망간 실리케이트계 투명 녹색 형광막의 제조 방법에 관한 것으로서, 보다 상세하게 설명을 하면, 서브마이크론(submicron) 이하의 입자크기를 갖는 구형 실리카를 제조한 후, 이를 아연 전구체와 망간 전구체 등을 포함하는 수용액에 첨가하여 제조한 아연/망간 실리케이트 겔을 소성하여 녹색의 형광체를 제조하거나 또는 상기 아연/망간 실리케이트 겔을 용액코팅하여 투명 녹색 형광막을 제조하는 방법에 관한 것이다. 본 발명의 제조방법으로 제조된 투명 녹색 형광막은 발광 특성 및 분산 특성이 우수하고, 가시광 영역에서 투과도가 우수하기 때문에, 투명 디스플레이 소자에 사용하기에 적합하다. 또한, 기존의 진공증착 시스템을 이용하여 제조한 박막형 형광막에 비교하여 발광효율 및 투광성이 높을 뿐만 아니라, 적색에서부터 청색까지 다양한 발광색을 변화시킬 수 있어서, 백색 디스플레이를 구현할 수 있다. 형광입자, 형광막, 코어-쉘, 스핀코팅, 발광, 아연/망간 실리케이트
Abstract:
PURPOSE: A calcium silicophosphate-based green electroluminescent phosphor is provided to be excited by an excitation light source of 250-450 nm, thereby imparting excellent luminescent brightness, and color purity. CONSTITUTION: A manufacturing method of calcium silicophosphate-based green electroluminescent phosphor comprises: a step of manufacturing a precursor mixture by weighing calcium precursor, silicon precursor, phosphorous precursor, and europium precursor within the content range of chemical formula 1: Ca_(7-x)(SiO_4)_2(PO_4)_2:xEu (0
Abstract:
본 발명은 신규한 자외선 여기용 적색 형광체로서, 더욱 상세하게는 바륨, 이트륨산화물을 함유하여 이루어진 모체와, 유로퓸을 활성원소로 이용하고 마그네슘을 첨가 이온으로 사용한 적색 형광체에 관한 것이다. 본 발명에 따른 적색 형광체는 250 ~ 300 nm 범위의 자외선 영역에서 높은 흡수 피크를 나타내고 우수한 색순도 특성 및 화학적으로 안정한 산화물을 기반으로한 조성물로서 고효율 적색 발광 물질로의 적용이 가능하다. 적색형광체, 자외선, 바륨, 이트륨, 유로퓸, 마그네슘
Abstract:
본 발명은 칼슘, 스트론튬, 바나듐 원소를 함유하여 이루어진 모체와, 유로퓸을 활성원소로 함유하는 적색형광체로, 250 nm 이상의 장파장 자외선 영역에서 높은 발광 효율을 나타내므로 자외선 여기 발광 다이오드를 여기 에너지원으로 사용 시 유용한 바나데이트계 적색형광체와 이의 제조방법에 관한 것이다. 적색 형광체, 장파장 자외선 여기용, 바나데이트
Abstract:
A red-emitting chlorapatite phosphor is provided to ensure red light emitting by excitation light source of 350~500 nm and excellent luminescent brightness, and to be applicable to a light emitting device for an ultraviolet excitation light emitting diode. A red-emitting chlorapatite phosphor has a composition represented by chemical formula 1: Ca_(5-2x)Na_x(PO_4)_3Cl : Eu_x. In the chemical formula 1, 0.3
Abstract:
A red phosphor, a LED(Light Emitting Diode) lamp using the red phosphor, and a CCFL(Cold Cathode Fluorescent) lamp using the red phosphor are provided to improve color purity and color rendition. A red phosphor has a composition represented by Sr_(1-x-y-z) Mg_x B4O7: Sm_y Eu_z, wherein x is a number of 0-0.1; y is a number of 0.0001-0.05; and z is a number of 0.0001-0.05. Preferably x is a number of 0.01-0.05; y is a number of 0.005-0.02; and z is a number of 0.002-0.01.
Abstract:
This invention relates to a method to induce growth of carbon nanotubes using a liquid phased-hydrocarbon based material under a critical range of equilibrating between liquid and gas phases, thereby easily manipulating a required carbon source. This invention also relates to a method to facilitate easy generation of a carbon backbone of the carbon nanotube because the reaction is performed in the presence of a metal nanoparticle or a metal compound capable of spontaneously generating a seed catalyst which stimulates the growth of carbon nanotubes as well as secures safety enough for the industrial application by using a mild reaction condition within the critical range. Accordingly, this invention can produce the carbon nanotube with high transition efficiency under a mild condition with a relatively lower temperature and pressure than those in conventional gas phased-methods without using a costly equipment, thereby cost-effectively producing the carbon nanotube in large quantities.