The document discusses organic light emitting diodes (OLEDs). It describes the structure of an OLED, which consists of a cathode, emissive layer, conductive layer, anode and substrate. Electrons enter through the cathode and holes through the anode. When they combine in the emissive layer, light is emitted. OLEDs have advantages like lower power consumption, flexibility and thinness, but also disadvantages such as limited lifespan and sensitivity to damage. Potential applications of OLEDs include mobile phones, displays, medical devices and more.

1. ORGANIC LIGHT EMITTING DIODE
(OLED)
PRATIM SARMA
B.sc 5th semester
Electronics Dept.
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2. CONTENTS
 INTRODUCTION
 STRUCTURE OF AN OLED
 WORKING PRINCIPLE OF OLED
 TYPES OF OLED’S
 ADVANTAGES OF OLED
 DISADVANTAGES OF OLED
 APPLICATIONS OF OLED
 CONCLUSION
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3. WHAT IS AN OLED?
An OLED is any light emitting
diode in which organic layers
are responsible for light
emission.
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Fig 1 Organic Light Emitting Diode

4. STRUCTURE OF AN OLED
 Cathode-it injects electrons.
 Emissive layer- it transport electrons from
cathode
 Conducting layer- it transport holes from
anode.
 Anode- it is kept transparent which is
made up of ITO (Indium Tin Oxide).
 Substrate-it supports the OLED.

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Fig 2: OLED Structure

5. HOW DO OLED’s Emit Light
 Electrons enter cathode
 Holes enter Anode
 Electrons enter Emissive layer
 Holes enter Conductive Layer
 Electrons and Holes Combine and They emitt Light.
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Fig 3: Working Principle of
OLED

7. TYPES OF OLED’S
 Passive –Matrix OLED
 Active-Matrix OLED
 Transparent OLED
 Top-Emitting OLED
 Foldable OLED
 White OLED
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8. ADVANTAGES
 Less power consumption
 Lower cost in future
 Flexible display
 Thin display
 Safer for environment.
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9. DISADVANTAGES
 Lifespan
 Easy damageable
 Outdoor performance
 Complex fabrication methods
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10. APPLICATIONS
 Mobile telephones
 Wall display
 Smart window
 Portable games
 Medical handheld devices
 Unbreakable display for school
 And many more that we cannot imagine even today
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11. CONCLUSION
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Fig 4: Comparison of OLED versus Others Technology

12. REFERENCES
 The OLED Handbook- Ron Mertens
 Basic Electronics-B.L. Theraja
 www.electronicshub.org
 www.slideshare.com
 www.explainthatstuff.com
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