Beyond Blue: New Horizons in Nitrides

Lead Research Organisation: University of Manchester
Department Name: Physics and Astronomy

Abstract

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Publications

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Binks D (2022) Cubic GaN and InGaN/GaN quantum wells in Applied Physics Reviews

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Blenkhorn WE (2018) Resonant photoluminescence studies of carrier localisation in c-plane InGaN/GaN quantum well structures. in Journal of physics. Condensed matter : an Institute of Physics journal

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Church S (2021) Photoluminescence efficiency of zincblende InGaN/GaN quantum wells in Journal of Applied Physics

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Church S (2017) Photoluminescence studies of cubic GaN epilayers in physica status solidi (b)

 
Description Droop in the efficiency of Nitride LEDs is one of the factors limiting their widespread deployment. We have found that droop occurs in bothy polar and nonpolar quantum well yielding important information non the underlying physics. More recent work on droop has revealed the role of excited localised states.
Preliminary work on cubic GaN has shown great promise. We have been awarded a 3 year EPSRC grant to extend the work on cubic material.

We have found that there is significant micron-scale variation in the emission efficiency across the QW, and that correlation of the properties of the emission (i.e. peak energy and intensity) are different in green emitting and blue emitting samples, indicating that different recombination mechanisms dominate. This has initiated a PhD project to explore this phenomenon which will try and relate this behaviour to differences in the microstructure.
Exploitation Route This work will help with the understanding of efficiency droop in LEDs.
The development of cubic GaN could lead to a new generation of LED materials
Sectors Digital/Communication/Information Technologies (including Software),Electronics,Energy

 
Description Several grant proposals were made to EPSRC, including two Program grant proposals, a proposal for an Industrial Hub and a responsive mode application. The latter was successful.
First Year Of Impact 2016
Sector Digital/Communication/Information Technologies (including Software),Electronics,Energy,Healthcare
Impact Types Societal

 
Description EPSRC Responsive mode
Amount £495,375 (GBP)
Funding ID EP/R010250/1 
Organisation Engineering and Physical Sciences Research Council (EPSRC) 
Sector Public
Country United Kingdom
Start 02/2018 
End 12/2020
 
Title Research data supporting "Local carrier recombination and associated dynamics in m-plane InGaN/GaN quantum wells probed by picosecond cathodoluminescence" 
Description Research data in support of the publication "Local carrier recombination and associated dynamics in m-plane InGaN/GaN quantum wells probed by picosecond cathodoluminescence". We have included the original data (tab-separated text files) as plotted for the quantum wells, measured by spatially- and time-resolved cathodoluminescence. 
Type Of Material Database/Collection of data 
Year Produced 2016 
Provided To Others? Yes  
 
Description Collaboration with Tyndall Insitute 
Organisation University College Cork
Department Tyndall National Institute
Country Ireland 
Sector Academic/University 
PI Contribution Input to theory work done at Tyndall Institute
Collaborator Contribution Theoretical input to program
Impact Significant number of papers
Start Year 2009
 
Description Cubic GaN 
Organisation Anvil Semiconductors
Country United Kingdom 
Sector Private 
PI Contribution This work is part of a joint program of work between us, the University of Cambridge and Anvil Semiconductors
Collaborator Contribution Anvil Semiconductors provide the substrate materials for our program on cubic GaN
Impact EPSRC responsive mode grant proposal that commenced Feb 2018
Start Year 2016
 
Description Exhibit at Blue Dot 
Form Of Engagement Activity A talk or presentation
Part Of Official Scheme? No
Geographic Reach National
Primary Audience Public/other audiences
Results and Impact Exhibit at Blue Dot of LED lighting science, Blue Dot is a major science festival held at Jodrell Bank.
Year(s) Of Engagement Activity 2016
 
Description University of the 3rd Age 
Form Of Engagement Activity A talk or presentation
Part Of Official Scheme? No
Geographic Reach Regional
Primary Audience Public/other audiences
Results and Impact Talk to organisation that provides forum for people in retirement to hear about scientific developments
Year(s) Of Engagement Activity 2016