ITO? What another materials can be used?
How about flexible transparent plastic?
Yes, it’s flexible display!!
EIL: Electron Injection Layer
ETL: Electron Transfer Layer
EML: Emission Material Layer
HTL: Hole Transfer Layer
HIL: Hole Injection Layer
Backplane
OLED
Encap. & Scribing
Module process
1. Low work-functon
2. Easy deposition
3. Low activity
flexible PCB로 대체할 수 있도록 한다. PCB 크기를 절반 이상 줄일 수 있으며 기판과 LCD 패널 사이의 연결점을 줄여 제품의 신뢰성 등도 크게 높일 수 있다.
부품 : BLU (Back Light Unit)
CCFL대비 LED가격이 3배 정도 비싸지만(상당히 유동적이다), 백색 LED를 백라이트광원으로 사용하면 기존의 RGB LEC로 사용하는
2. Transparent Electrodes
투명 전극 (transparent electrodes)
가시광 영역의 빛을 투과 & 전기 전도성을 가지는 기능성 박막전극
유연성을 가짐
평판디스플레이, 터치패널, 태양전지 등의 전극기판으로 널리 이용
→ 정보전자 에너지 분야의 핵심 부품 소재
flexible display용 투
moves toward
N type semiconductor
↓
Electrode formed
Current flows
↓
Solar cell generate
plastic film type solar cell
Prospect : Due to thinness and flexibleness, it is able to print. Cheap and variety useful products are expected that couldn't imagine before for solar cell
→ U.S.A. KONARKA and PLEXTRONICS company are on research for practical products project
[Anode material]
The potential that is close the standard electrode potential of Li.
High energy density per volume & weight
Excellent cycle stability (Coulomb effeciency)
Have to endure rapid charging or discharging
Stability
.
.
.
[High Voltage]
[Pollution-Free]
[long cycle life]
[No Memory Effect]
[Safer than Lithium ion battery]
[lower internal resistivity]
[advantageous
What is OLED?
(SM) OLED Small Molecule Organic Light Emitting Diode.
The original technology developed to exploit the light emitting property of
some organic chemicals. Has been the basis of most commercial products to
date.
What is Hybrid LED?
Hybrid LED compensate
the defect of OLED
Good color
Improved power efficiency
Low cost, large area
Flexibility
H
V-led는 아래에서부터 순서대로 metal substrate(p-type electrode의 역할을 함), reflector, P-GaN, MQW, N-GaN, n-electrode의 구조 순서로 쌓여있는 것을 확인할 수 있다.
기존의 LED와는 다르게 metal substrate를 지지대로 붙어 있기 때문에 p-type electrode가 n-type보다 아래쪽으로 오도록 배열시킨 특이한 구조이다. 또한 아랫부
electrodes, respectively.
An exciton is a bound state of an electron and hole which are attracted to each other by the electrostatic Coulombic force.
The exciton diffuses to around by chemical potential.
The lifetime <<1 nano seconds
The average distance <<10 nanometer.
The exciton diffuses to the interface between two layers
The exciton is saparated by an electron an
Super-capacitors
EDLC(electrochemical double layer capacitors)
→ store E using ion adsorption
Pseudo-capacitors
→ fast surface redox reactions
→ higher capacitance than EDLC
Redox super-capacitors
electron transfer caused by electrochemical oxidation and reduction of active reagents
between two electrodes with different potentials
charge transfer properties
investigating
OLED
:Organic Light Emitting Diode
Organic means…
→Electroluminescent layer is
:a film of organic compound
(ex. C2, H2, O2, other polymers)
not semiconductor →used in LED
1.Self-luminescence
The biggest difference between LCD is that it is self-luminescence. It means that the diode can emit the light itself so it has the good visibility although there is ligh