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
First, Substrate is consists of a plastic or glass, a portion of the OLED is supportive.Anode is a role that make electron holes when current flows by removing electron. And the upper Conducting Layer is the place that Electron Holes is being created.Emissive Layer is the place accepting an electron from Cathode and produce light.
Emissive layer and conducting layer are called organic layer beca
Free(wannier-mott)
Radius >> a(exciton Bohr radius)
Small binding energy :~ 0.01 eV
Delocalized states
Move freely through crystal
(semiconductors)
Tighthly-bound(Frenkel)
Radius ~ a(exciton Bohr radius)
large binding energy : 0.1 -1.0 eV
localized on one lattice site
Moving by hopping
(insulators and molecules)
Eadd = △E + Ec
Ec = e2/C
C = 2πεεod
(depend on geometr
Let’s start from the transistor. How many of you know about the transistor?
Basically, the transistor can be categorized in two parts, which are BJT and FET
In easy words, BJT uses current to make the transistor work, and FET uses Voltage.
A bipolar transistor has terminals labeled base, collector, and emitter. A small current at the base terminal, which is flowing t
Emitting Diode)란 발광다이오드의 약자로 화합물반도체의 성을 이용해 전기신호를 적외선 또는 빛으로 변환시켜 신호를 보내고 받데 사용되는 반도체소자를 말하며 전자제품류와 가정용 가전제품, 리모컨, 자동차 계기판, 전광판, 각종 자동화 기기 등에 사용된다. LED는 IRED(Infrared Emitting Diode) 와 VLED(Visible