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LIGHT EMITTING DIODE (LED)

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Outline ◎ Sooseok - Introduction - Nitride Based LED Technology ◎ Xia - White LED Technology - Chromaticity and Color Rendering ◎ Lakshminarayanan - LED Basics & Ongoing Research & Applications - White LED Market Analysis and Patent related Issue ◎ Fang - Competitors for White Light Technology - OLED and Quantum dots based LED Technology

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LIGHT EMITTING DIODE

(LED)

LED group

EE 226

Sept. 26, 2007

Sooseok

Xia

Lakshminarayanan

Fang

EE 226 – LED Group

Outline



Sooseok



Introduction



Nitride Based LED Technology



Xia



White LED Technology



Chromaticity and Color Rendering



Lakshminarayanan



LED Basics & Ongoing Research & Applications



White LED Market Analysis and Patent related Issue



Fang



Competitors for White Light Technology



OLED and Quantum dots based LED Technology

EE 226 – LED Group

Introduction



Background



LED is a semiconductor diode that emits

narrow spectrum light when electrically

biased in forward direction. It is a form of

Electroluminescence (EL)



Advantage over conventional bulb



High luminescence efficiency



Quick response time



Long lifetime

EE 226 – LED Group

Comparison

between light bulb and LED

Light bulb LED

Power consumption

RED

YELLOW

GREEN

70W

18W

20W

17W

Replacement Interval 6 ~ 12 month 5 ~ 10 years

(estimated)

Failure mode Sudden total failure Gradual intensity

decrease

Visibility Use color filter, reflects

sunlight

Direct

Cost

Maintenance

Manufacturing

Expensive

Cheap

Expensive

Luminous Efficacy

(lm/w)

10 ~ 85lm/W 100 lm/w

EE 226 – LED Group

Light Emission process



Recombination of electron in conduction

band with hole in valence band releases

photon energy of well-defined frequency

Forward biased

electron

hole

= hv

h: Planck’s constant (6.626x10

-34

J-s)

v: wave frequency

e.g) GaN: 360nm

k (momentum)

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richyrichy

2014-02-27

It's a content rich present file focus on LED technology by San Jose State University. High power packaging, white LED, and OLED are included.