Research Laboratory for Optoelectronic Materials

Micro / Nano LED display & application
  • Research
  • Micro / Nano LED display & application
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InGaN/GaN Nanorod LED

Flexible nanord LED

Application

Bio compatible flexible LED lighting for photodynamic therapy

Application

Bio compatible flexible LED mask

Flexible nanorod LED

PL measurement after CQD coating

Application: Flexible nanorod LED display

Nanorod alignment

Schematic image after nanorod LED alignment

Nanostructured InAlGaP Red LED

Concept

SEM & EL

  • NPs + Nanorod

  • As-etched nanohole

  • NPs + Nanorod

  • NPs + Nanohole

Au@SiO2 NPs

Measurement

  • I-V characteristics for nanostructured InAlGaP red LED

  • L-I characteristics for nanostructured InAlGaP red LED

  • PL characteristics for nanostructured InAlGaP red LED

  • PL characteristics for nanostructured InAlGaP red LED

  • Plasmoncollective oscillations of the free electron gas density
  • Surface plasmonplasmon that are confined to surfaces and interact strongly with light
  • Localized surface plasmonsurface plasmon in nanometer sized structures

Localized surface plamon

Energy coupling

Surface plasmon LED

Optical Properties of Ag@SiO2 NPs on MQW

Ag@SiO2 NPs embedded nanorod LED

Micro LED display

크기에 따른 비교

LCD,OLED,µ-LED 비교

LCD OLED µ-LED
Energy consumption Medium Medium Very low
Pixel density Up to 1000PPI
(current commercial:500)		 2500PPI demonstrated
(Micro Displays)		 Up to 5000PPI
Brightness < 2000Cd/m2 < 1000Cd/m2 Up to 1E6 Cd/m2
Contrast Low to medium High High
Lifetime Good Medium Best
Enviromental stability Good Medium Best
Refresh rates Low (ms) High (µs) Very high (ns)
Viewing angle Low High High
Flexibility Low High High
Maturity of technology High Medium Low
Cost Low Medium Medium

Micro LED 적용가능분야

기존 micro LED의 문제점

마이크로 LED 제작시 식각에 의한 plasma damage
LED 크기 감소에 따른 sidewall effect로 인해 효율저하 발생

Device passivation을 통한 효율 향상

Chemical treatment를 통한 damage layer 제거 기술개발
Dielectric passivation을 통한 device passivation 기술개발

전사와 비전사 공정에 따른 응용제품

Concent

Capillary force-driven self-assembly

Magnetic force-driven self-assembly

Transfer

Fluidic self-assembly of micro LED