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Organic Light-Emitting Transistors: Towards the Next Generation Display Technology



Organic Light-Emitting Transistors: Towards the Next Generation Display Technology

Michele Muccini, Stefano Toffanin

ISBN: 978-1-119-19011-0 March 2016 288 Pages


Provides an overview of the developments and applications of Organic Light Emitting Transistors (OLETs) science and technology

This book discusses the scientific fundamentals and key technological features of Organic Light Emitting Transistors (OLETs) by putting them in the context of organic electronics and photonics. The characteristics of OLETs are benchmarked to those of OLEDs for applications in Flat Panel Displays and sensing technology. The authors provide a comparative analysis between OLED and OLET devices in order to highlight the fundamental differences in terms of device architecture and working principles, and to point out the enabling nature of OLETs for truly flexible displays. The book then explores the principles of OLET devices, their basic optoelectronic characteristics, the properties of currently available materials, processing and fabrication techniques, and the different approaches adopted to structure the active channel and to control organic and hybrid interfaces.

  • Examines the photonic properties of OLETs, focusing on the external quantum efficiency, the brightness, the light outcoupling, and emission directionality
  • Analyzes the charge transport and photophysical properties of OLET, emphasizing the excitonic properties and spatial emitting characteristics
  • Reviews the key building blocks of the OLET devices and their role in determining the device’s performance
  • Discusses the challenges in OLET design, namely color gamut, power efficiency, and reliability
  • Presents key applications of OLET devices and their potential impact on display technology and sensing
Organic Light-Emitting Transistors: Towards the Next Generation Display Technology serves as a reference for researchers, technology developers and end-users to have a broad view of the distinguishing features of the OLET technology and to profile the impact on the display and sensing markets.

1 Introduction 1

2 Organic LightEmitting Diodes 5

2.1 Oled Device Structure and Working Principles 5

2.2 Applications of Oled Technology 20

2.3 Diode Versus Transistor Architecture for Light Emission 31

2.4 Conclusions 38

References 38

3 Organic LightEmitting Transistors: Concept, Structure, and Optoelectronic Characteristics 45

3.1 Working Principles of Olets 46

3.2 Device Structures 57

3.3 Thin‐Film Olets 61

3.3.1 Single‐Layer Olets 61

3.3.2 Multilayer Olets 68

3.4 Single‐Crystal Olet 73

3.5 Conclusions 82

References 82

4 Key Building Blocks of Olets 87

4.1 Dielectric Layer 87

4.2 Emissive Ambipolar Semiconductors 103

4.3 Charge‐Injecting Electrodes 129

4.4 Conclusions 146

References 146

5 ChargeTransport and Photophysical Processes in Olets 153

5.1 Charge Transport in Olets 153

5.2 Fundamental Excitonic Processes and Modeling of Olets 170

5.3 Excitonic Recombination and Emitting Area in Olets 180

5.4 Conclusions 195

References 196

6 Photonic Properties of Olets 201

6.1 External Quantum Efficiency 201

6.2 Brightness 212

6.3 Light Outcoupling and Emission Directionality 220

6.4 A Possible Route for Organic Injection Lasing 230

6.5 Conclusions 236

References 236

7 Applications Of Organic LightEmitting Transistors 243

7.1 Olet Display Technology 244

7.2 Olet‐Based Sensing 254

7.3 Open Issues and Next Development Targets 265

7.3.1 Color Gamut 265

7.3.2 Power Efficiency 267

7.3.3 Lifetime 268

7.4 Conclusions 271

References 271

8 Conclusions 277

Index 279