Beyond Blue: New Horizons in Nitrides
Lead Research Organisation:
University of Manchester
Department Name: Physics and Astronomy
Abstract
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Publications
Hammersley S
(2016)
Effect of QW growth temperature on the optical properties of blue and green InGaN/GaN QW structures
in physica status solidi c
Hammersley S
(2014)
Carrier distributions in InGaN/GaN light-emitting diodes
in physica status solidi (b)
Dunn A
(2016)
Investigating efficiency droop in InGaN/GaN quantum well structures using ultrafast time-resolved terahertz and photoluminescence spectroscopy
in physica status solidi c
Dawson P
(2016)
The nature of carrier localisation in polar and nonpolar InGaN/GaN quantum wells
in Journal of Applied Physics
Davies M
(2016)
Comparative studies of efficiency droop in polar and non-polar InGaN quantum wells
in Applied Physics Letters
Church S
(2021)
Photoluminescence efficiency of zincblende InGaN/GaN quantum wells
in Journal of Applied Physics
Church S
(2018)
Effect of stacking faults on the photoluminescence spectrum of zincblende GaN
in Journal of Applied Physics
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 |