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Electronic Materials Research Lab in Physics, http://smartpolymer.korea.ac.kr
OLED (Organic Light Emitting Diode)
Electronic Materials Research Lab in Physics, http://smartpolymer.korea.ac.kr
OLED (Organic Light Emitting Diode)
OLED : 유기 발광 다이오드물질무기물 (Inorganic) : 유기물 이외의 물질유기물 (Organic ) : 탄소 (carbon) 을 중심으로 공유결합을 하고 있는 물질
다이오드 : Ohm 의 법칙을 따르지 않는 전자소자
간접 : 간접 조명을 통한 발광 ( 예 , LCD)직접 : 소자 구성 물질에서 자체 (self) 발광 ( 예 , OLED)
발광 (Light Emitting)
Ohm 의 법칙 다이오드 : 한쪽 방향으로만
전기신호가 흐름
I
V
I
V
Electronic Materials Research Lab in Physics, http://smartpolymer.korea.ac.kr
OLED (Organic Light Emitting Diode) 원리다이오드 종류 ( 주로 반도체의 경우 )
• 발광 다이오드 , ( 디스플레이 )• 포토 다이오드 , (Einstein 광전효과 이용 , 디지털 camera, 촬영기 )• 터널 다이오드 , ( 반도체 전자소자 )
기존 무기물 다이오드를 이용한 디스플레이
Electronic Materials Research Lab in Physics, http://smartpolymer.korea.ac.kr
OLED 용 물질고분자 (Polymer)
n
C6H13
C6H13
DHF-PPV
O
OCH3
n
MEH-PPV
n
PPV
N
O
n
CzEH-PPV
ON
N
O
n
OxdEH-PPV
Electronic Materials Research Lab in Physics, http://smartpolymer.korea.ac.kr
Liq Naq
Znq2
OLED 물질저분자
N N
NPB
Phthalocyanine
Electronic Materials Research Lab in Physics, http://smartpolymer.korea.ac.kr
Solid State Solvation Effect
EL Spectrum Tuning Alq3
High DCM2Bulovic et al. Chem. Phys. Lett. 287, 455(1998); 308, 317(1999)
Electronic Materials Research Lab in Physics, http://smartpolymer.korea.ac.kr
OLED (Organic Light Emitting Diode) 원리광에 의한 발광
)(빛h Electron transferTo the acceptor site
Electronic Materials Research Lab in Physics, http://smartpolymer.korea.ac.kr
OLED (Organic Light Emitting Diode) 원리
입사에너지빛
전공 (hole)
빛 에너지에 의한 광 방출 (Photoluminescence, PL)
전자 - 전공의 pair : “exciton”Exciton 형성 후 안정된 상태
光 방출
양극 (anode)
음극(cathode)
발광물질
Electronic Materials Research Lab in Physics, http://smartpolymer.korea.ac.kr
OLED 원리
光 에너지
전공 (hole)
Photoluminescence (PL) Electroluminescence (EL)
전자 (electron)
光
光 발생
Electronic Materials Research Lab in Physics, http://smartpolymer.korea.ac.kr
OLED Cell
전극 (Al) : 전자 주입전극유기 발광 물질 투명전극 (ITO) : 전공 (hole) 주입전극
Glass
光 발생
Electronic Materials Research Lab in Physics, http://smartpolymer.korea.ac.kr
Passive Matrix Organic LED
Relatively Small Display
Weak for Multicolor
Electronic Materials Research Lab in Physics, http://smartpolymer.korea.ac.kr
Monochrome Passive-Matrix Polymer-LED Display
Electronic Materials Research Lab in Physics, http://smartpolymer.korea.ac.kr
Active Matrix Organic LED
Pixel 전극ITO
Capacitor
유기 EL 동작 1. Gate Line 전압 인가 2. TFT Turn-on3. 픽셀에 신호전류인가4. LED 동작5. 화면 표시 변화
GATE
Electronic Materials Research Lab in Physics, http://smartpolymer.korea.ac.kr
Transparent & Flexible Transistor
Substrate polyimideInsulator polyvinylphenol
Semiconductor polythienylenevinyleneElectrodes poyaniline
TransparentFlexible
Electronic Materials Research Lab in Physics, http://smartpolymer.korea.ac.kr
Full-Color OLED Display
Active Matrix
Electronic Materials Research Lab in Physics, http://smartpolymer.korea.ac.kr
Applications of Organic LED
CDT Ltd.
( 상상도 )UNIAX – Heeger 가 설립
Electronic Materials Research Lab in Physics, http://smartpolymer.korea.ac.kr
FOLED-based Pixelated, Monochrome Display
Electronic Materials Research Lab in Physics, http://smartpolymer.korea.ac.kr
Technology LandscapeTechnology/ Features AMLCD PMLCD LED PDP FED OLED
Brightness Good Good Very Good Good Good Very Good
Resolution High High Low Medium High High
Voltage Low Low High High High Low
Viewing Angle Medium Poor Excellent Excellent Excellent Excellent
Contrast Ratio Good Fair Good Poor-Good Good Excellent
Response Time Good Good Fast Very Fast Very Fast Very Fast
Power efficiency Good Good Fair-Good Medium Very Good Very Good
Temp. Range Poor Poor Very Good Very Good Very good Very good
Form Factor Thin Thin Wide Wide Thin Very Thin Conformable
Weight Light Light Above Avg. Heavy Light Light
Screen Size Small-Large Small-Medium Small-Large Large Medium Small-Large
Primary Applications Laptops, Desktop
Small Display Signs, indicators Large Screen Multiple MultipleNew/ Existing
Cost Average Low High High Average Below Avg.
Beautiful!!!
Electronic Materials Research Lab in Physics, http://smartpolymer.korea.ac.kr
Electronic Materials Research Lab in Physics, http://smartpolymer.korea.ac.kr
Organic EL Research Trend & Future
Small
OrganicElectronic luminescence
Medium
LCD
Large
Plasma Display
Electronic Materials Research Lab in Physics, http://smartpolymer.korea.ac.kr
PLED (Polymer Light Emitter Diode)
2000 년 Nobel 화학상에 공헌
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