● Definition of plasmaPlasma is one of the four fundamental states of matter, along with solid, liquid, and gas. It is an ionized gas consisting of a collection of charged particles, including ions, electrons, and neutral atoms or molecules. Plasma can be found naturally in the universe in the form of stars, lightning, and auroras, but it can also be artificially created and controlled for
Introduction (What is plasma?)
1. Definition of plasmaPlasma is one of the four fundamental states of matter, along with solid, liquid, and gas. It is an ionized gas consisting of a collection of charged particles, including ions, electrons, and neutral atoms or molecules. Plasma can be found naturally in the universe in the form of stars, lightning, and auroras, but it can also be artif
Phosphor (Energy Converter)
Inorganic phosphor materials
“Classical” inorganic phosphors usually consist of a host lattice with activator ions doped into it in small concentrations, typically a few mole percent or less.
Host lattice & Activator ion
1st type : weak interaction (Ln3+)
2nd type: strong interaction ( Mn2+, Eu2+, Ce3+, Pb2+,Sb3+, Ce3+, MoO42-, NbO43-)
Activator (+ Sensit
Introduction
What is Plasma?
Plasma is the fourth state of matter;
solid, liquid, gas and plasma.
Composition matter of universe
What is Atmospheric plasma?
It is easier to produce plasma in low pressure condition than atmospheric, but producing plasma in vacuum state needs many devices.
So, many researcher study that how to produce plasma in atmospheric condition.
This pictur
PE CVD
PE CVD공정은 Plasma etching 이 사용되기 이전부터 반도체 금속배선의 보호막인 SiN과 SiO2를 저온에서 증착할 수 있는 새로운 생성원으로 소개
PE CVD기술은 SiO2와 SiN 박막 형성 뿐만 아니라 최근에는 천이금속이나 천이금속 실리사이드 형성에도 널리 사용
PE CVD의 박막 형성 mechanism
Plasma 에서 이
Part 1. PDP의 정의
A plasma display panel (PDP) is a type of flat panel display common to large TV displays (32 in/81 cm or larger). Many tiny cells between two panels of glass hold a mixture of noble gases.
The gas in the cells is electrically turned into a plasma which emits ultraviolet light which then excites phosphors to emit visible light. `
Part 2. PDP 장,단점
The transfer of thermal energy between neighboring molecules in a substance due to a temperature gradient.
2) It always takes place from a region of higher temperature to a region of lower temperature, and acts to equalize temperature differences.
3) Conduction takes place in all forms of matter. (solids, liquids, gases and plasmas)
Thermal conductivity k is physical property of the su
1. Objective
Probe를 통해 얻어진 V-I곡선을 이용하여 plasma의
특성(temperature, density 등)을 알아본다.
Pressure와 방전 Gas의 변화에 따라 plasma의 특성이
어떻게 변화하는지 알아본다.
Particle balance equation을 이용해 electron과 ion의 density를 구해본 후 실험값과 비교해본다.
B1조의 radial 방향의 전자,
plasma는 생선된다.
키홀에 침투한 레이저 빔은 각각의 순간 일부의 에너지를 흡수하는 표면 재료 플라스마 경계에서 여러 번 반사된다. 이 방법은 더 많은 에너지가 재료에 결합된다. CO2레이저로 용접을 할 때 다른 이점은 에너지가 소재에 결합하는 것을 도와준다는 점이다.
플라스마의 흡수계수(CO2