Light Emitting Field-Effect Transistors: A Route to Injection Lasing in Organic Materials

Lead Research Organisation: Durham University
Department Name: Engineering

Abstract

Organic semiconductors combine novel optoelectronic properties, with simple fabrication and the scope for tuning the chemical structure to give desired features, making them attractive candidates for the applications in almost every economic and industrial sector. Organic dye-lasers (optically pumped) are currently used in communication and medical applications because their colour can be easily tuned, and they are low-cost. However, the organic dyes used in these lasers cannot be electrically pumped because of the intrinsic limitations (poor charge transport and luminance quenching) of the organic materials, which remains a major challenge for the researchers to achieve better materials, processing methods and device architectures. This project addresses the research challenges in i) achieving high performance material combinations and device structures of novel light-emitting field-effect transistor (LEFET) that eliminate any inefficiencies for, ii) developing high speed optoelectronic devices and (iii) the creation of high current density and exciton densities above lasing threshold for suitable low-loss optical feedback structures. Electrically pumped solid-state organic lasers are highly attractive technology due to their potential in achieving colours at a relative ease, that are difficult to realise with inorganic lasers, and this will allow the improvement and creation of a wide range of new applications in communications, biomdecial sensors and displays.

Publications

10 25 50
 
Description The impact of high current density, high applied electric field, the duration of operation, and the traps inside the lasing material impact the lasing threshold and its efficiency. A manuscript on these findings is underway for publication.
Exploitation Route The project will provide guidelines for device development and materials synthesis.
Sectors Electronics

 
Description B1500A Semiconductor Device Parameter Analyzer with 6 SMUs and a Pulser
Amount £54,612 (GBP)
Organisation Durham University 
Sector Academic/University
Country United Kingdom
Start 03/2022 
 
Description Seedcorn Fund: Development of highly sensitive electronic nose for explosive detection
Amount £13,200 (GBP)
Organisation Durham University 
Sector Academic/University
Country United Kingdom
Start 03/2022 
End 06/2023
 
Title Fast Pulsing 
Description Electrical nanosecond transient spectroscopy system is established.This system enables to apply 100V pulse of 1ns duration and being used for fast electrical characterisation of optoelectronic devices. This will also enable to develop new projects and tools to efficiently and effectively characterise the optoelectronic devices. 
Type Of Material Improvements to research infrastructure 
Year Produced 2023 
Provided To Others? No  
Impact Thus fas the organic light emitting devices (OLEDs) are charcterised using oticval spectrocopy systems. This is a unique electro-optical transient characterisation system, which enables partually characterise those device in real envoirnment. The system will be further developed to lead the area of OLEDs. 
 
Description Kar Leo Group (Dresden, Germany) 
Organisation Technical University of Dresden
Country Germany 
Sector Academic/University 
PI Contribution novel device arctecture and characterisation system
Collaborator Contribution Developing photonic structures and novel micro-cavity-based components
Impact none yet
Start Year 2022
 
Description Materials from Adachi group (Kyushu, Japan) 
Organisation Kyushu University
Country Japan 
Sector Academic/University 
PI Contribution Offering a new device and testing platform to test novel materials
Collaborator Contribution Organic injection lasing, including low-threshold lasing materials.
Impact None yet
Start Year 2022
 
Description A PDRA from teh project: ICSM is the largest conference devoted to the field of organic electronics and has showcased many of the most important developments in the field over the last 40 years. The Glasgow meeting showed the latest developments across the field. Dr dos Santos presented a poster entitled "Do Columnar Liquid Crystal Films show Delayed Fluorescence via Triplet-Triplet Annihilation?" which was awarded the best poster from the Royal Society of Chemistry. Over 50 people have attende 
Form Of Engagement Activity A talk or presentation
Part Of Official Scheme? No
Geographic Reach National
Primary Audience Postgraduate students
Results and Impact PdS as PDRA from teh project: ICSM is the largest conference devoted to the field of organic electronics and has showcased many of the most important developments in the field over the last 40 years. The Glasgow meeting showed the latest developments across the field. Dr dos Santos presented a poster entitled "Do Columnar Liquid Crystal Films show Delayed Fluorescence via Triplet-Triplet Annihilation?" which was awarded the best poster from the Royal Society of Chemistry. Over 50 people have attended poster.
Year(s) Of Engagement Activity 2022
URL https://icsm2022.com/
 
Description PDRA from the project: ICEL 2022 provided a platform for exchange with experts from all over the world who are involved in research, development, and manufacturing of emissive materials. Presentations spanned from materials and fundamental physics to their application in the latest devices and applications. We discussed organic semiconductors, perovskites, quantum dots and hybrid materials. Dr dos Santos presented an invited talk entitled "Highly Efficient and Narrowband Blue OLEDs" which had o 
Form Of Engagement Activity A talk or presentation
Part Of Official Scheme? No
Geographic Reach National
Primary Audience Postgraduate students
Results and Impact PDRA from the project: ICEL 2022 provided a platform for exchange with experts from all over the world who are involved in research, development, and manufacturing of emissive materials. Presentations spanned from materials and fundamental physics to their application in the latest devices and applications. We discussed organic semiconductors, perovskites, quantum dots and hybrid materials. Dr dos Santos presented an invited talk entitled "Highly Efficient and Narrowband Blue OLEDs" which had over 100 attendees.
Year(s) Of Engagement Activity 2022
URL https://icel2022.org/