Beyond Blue: New Horizons in Nitrides
Lead Research Organisation:
University of Manchester
Department Name: Physics and Astronomy
Abstract
Abstracts are not currently available in GtR for all funded research. This is normally because the abstract was not required at the time of proposal submission, but may be because it included sensitive information such as personal details.
Publications
Zhu T
(2016)
Local carrier recombination and associated dynamics in m -plane InGaN/GaN quantum wells probed by picosecond cathodoluminescence
in Applied Physics Letters
Spencer BF
(2022)
Characterization of buried interfaces using Ga Ka hard X-ray photoelectron spectroscopy (HAXPES).
in Faraday discussions
Spencer B
(2016)
Terahertz cyclotron resonance spectroscopy of an AlGaN/GaN heterostructure using a high-field pulsed magnet and an asynchronous optical sampling technique
in Applied Physics Letters
Schulz S
(2016)
Theoretical and experimental analysis of the photoluminescence and photoluminescence excitation spectroscopy spectra of m -plane InGaN/GaN quantum wells
in Applied Physics Letters
Massabuau F
(2019)
Optical and structural properties of dislocations in InGaN
in Journal of Applied Physics
Kundys D
(2016)
A study of the optical and polarisation properties of InGaN/GaN multiple quantum wells grown on a-plane and m-plane GaN substrates.
in Science and technology of advanced materials
Humphreys CJ
(2017)
The atomic structure of polar and non-polar InGaN quantum wells and the green gap problem.
in Ultramicroscopy
Hibberd M
(2016)
Dielectric response of wurtzite gallium nitride in the terahertz frequency range
in Solid State Communications
Hammersley S
(2015)
Effects of quantum well growth temperature on the recombination efficiency of InGaN/GaN multiple quantum wells that emit in the green and blue spectral regions
in Applied Physics Letters
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. In particular, this grant was used to support some initial measurements on cubic GaN that was included in the successful grant proposal. This subsequent work on cubic GaN has resulted in a patent application, and the formation of a spin out company, Kubos Semiconductors plc (https://www.kubos-semi.com/), who has also licenced the IP associated with the patent application. |
First Year Of Impact | 2022 |
Sector | Digital/Communication/Information Technologies (including Software),Electronics,Energy |
Impact Types | Economic |
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 | Data supporting publication entitled "Disentangling the impact of point defect density and carrier localisation enhanced Auger recombination on efficiency droop in (In,Ga)N/GaN quantum wells" |
Description | Phototluminescence intensity vs carrier density for three samples grown at different temperatures; Phototluminescence transients for these samples; Calculated radiative and Auger recombination coefficients. |
Type Of Material | Database/Collection of data |
Year Produced | 2023 |
Provided To Others? | Yes |
Impact | This data allows the internal quantum efficiency of an InGaN/GaN quantum well to be determined for the first based on atomistic calculations of the radiative and Auger-Meitner recombination coefficients. |
URL | https://figshare.manchester.ac.uk/articles/dataset/Data_supporting_publication_entitled_Disentanglin... |
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 |