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2019
6 Downloads (Pure)

Room temperature cathodoluminescence quenching of Er3+ in AlNOEr

Brien, V., Edwards, P. R., Boulet, P. & O'Donnell, K. P., 31 Jan 2019, In : Journal of Luminescence. 205, p. 97-101 5 p.

Research output: Contribution to journalArticle

Open Access
File
Erbium
Cathodoluminescence
cathodoluminescence
Quenching
Phonons
2018
3 Citations (Scopus)
26 Downloads (Pure)

Eu-Mg defects and donor-acceptor pairs in GaN: photodissociation and the excitation transfer problem

Singh, A. K., O'Donnell, K. P., Edwards, P. R., Lorenz, K., Leach, J. H. & Boćkowski, M., 22 Jan 2018, In : Journal of Physics D: Applied Physics. 51, 6, 5 p., 065106.

Research output: Contribution to journalArticle

Open Access
File
Photodissociation
photodissociation
Defects
defects
Photoluminescence
3 Citations (Scopus)
9 Downloads (Pure)

Extended X-ray absorption fine structure study of Er bonding in AlNO:Erx films with x <= 3.6%

Katsikini, M., Katchkanov, V., Boulet, P., Edwards, P. R., O'Donnell, K. P. & Brien, V., 28 Aug 2018, In : Journal of Applied Physics. 124, 8, 5 p., 085705.

Research output: Contribution to journalArticle

Open Access
File
fine structure
x rays
sublattices
radio frequencies
magnetron sputtering
10 Downloads (Pure)

Hysteretic photochromic switching (HPS) in doubly doped GaN(Mg):Eu—a summary of recent results

Edwards, P. R., O'Donnell, K. P., Singh, A. K., Cameron, D., Lorenz, K., Yamaga, M., Leach, J. H., Kappers, M. J. & Boćkowski, M., 22 Sep 2018, In : Materials. 11, 10, 9 p., 1800.

Research output: Contribution to journalArticle

Open Access
File
europium
emission spectra
light emitting diodes
templates
rare earth elements
2017
6 Citations (Scopus)
78 Downloads (Pure)

Hysteretic photochromic switching of Eu-Mg defects in GaN links the shallow transient and deep ground states of the Mg acceptor

Singh, A. K., O'Donnell, K. P., Edwards, P. R., Lorenz, K., Kappers, M. J. & Bokowski, M., 3 Feb 2017, In : Scientific Reports. 7, 6 p., 41982.

Research output: Contribution to journalArticle

Open Access
File
ground state
defects
configurations
luminous intensity
time dependence
4 Citations (Scopus)
31 Downloads (Pure)

Luminescence of Eu3+ in GaN(Mg, Eu): transitions from the 5D1 level

Singh, A. K., O'Donnell, K. P., Edwards, P. R., Cameron, D., Lorenz, K., Kappers, M. J., Boćkowski, M., Yamaga, M. & Prakash, R., 14 Dec 2017, In : Applied Physics Letters. 111, 24, 4 p., 241105.

Research output: Contribution to journalArticle

Open Access
File
luminescence
photoluminescence
temperature dependence
cooling
defects
4 Citations (Scopus)
24 Downloads (Pure)

Validity of Vegard's rule for Al1-xInxN (0.08<x<0.28) thin films grown on GaN templates

Magalhães, S., Franco, N., Watson, I. M., Martin, R. W., O'Donnell, K. P., Schenk, H. P. D., Tang, F., Sadler, T. C., Kappers, M. J., Oliver, R. A., Monteiro, T., Martin, T. L., Bagot, P. A. J., Moody, M. P., Alves, E. & Lorenz, K., 28 Apr 2017, In : Journal of Physics D: Applied Physics. 50, 20 p., 205107.

Research output: Contribution to journalArticle

Open Access
File
Rutherford backscattering spectroscopy
Spectrometry
Lattice constants
lattice parameters
backscattering
2016
17 Citations (Scopus)
121 Downloads (Pure)

Crystalfield symmetries of luminescent Eu3+ centers in GaN: the importance of the 5D0 to 7F1 transition

O'Donnell, K. P., Edwards, P. R., Yamaga, M., Lorenz, K., Kappers, M. J. & Boćkowski, M., 11 Jan 2016, In : Applied Physics Letters. 108, 2, 5 p., 022102.

Research output: Contribution to journalArticle

Open Access
File
Defects
defects
symmetry
Optical devices
Optoelectronic devices
2015
4 Citations (Scopus)
15 Downloads (Pure)

Analysis of the stability of InGaN/GaN multiquantum wells against ion beam intermixing

Redondo-Cubero, A., Lorenz, K., Wendler, E., Magalhães, S., Alves, E., Carvalho, D., Ben, T., Morales, F. M., García, R., O'Donnell, K. P. & Wetzel, C., 1 Oct 2015, In : Nanotechnology. 26, 42, 6 p., 425703.

Research output: Contribution to journalArticle

Open Access
File
Ion beams
Semiconductor quantum wells
Ions
Amorphization
Stacking faults
3 Citations (Scopus)
145 Downloads (Pure)

Composition, structure and morphology of Al1-xInxN thin films grown on Al1-yGayN templates with different GaN contents

Magalhães, S., Watson, I. M., Pereira, S., Franco, N., Tan, L. T., Martin, R. W., O'Donnell, K. P., Alves, E., Araújo, J. P., Monteiro, T. & Lorenz, K., 14 Jan 2015, In : Journal of Physics D: Applied Physics. 48, 1, 10 p., 015103.

Research output: Contribution to journalArticle

Open Access
File
templates
Thin films
Surface roughness
thin films
Chemical analysis
1 Citation (Scopus)
79 Downloads (Pure)

Indirect excitation of Eu3+ in GaN codoped with Mg and Eu

Yamaga, M., Watanabe, H., Kurahashi, M., O'Donnell, K. P., Lorenz, K. & Boćkowski, M., 17 Jun 2015, In : Journal of Physics: Conference Series . 619, 1, 4 p., 012025.

Research output: Contribution to journalArticle

Open Access
File
excitation
crystal field theory
parity
energy levels
fine structure
13 Citations (Scopus)
75 Downloads (Pure)

Luminescence studies on green emitting InGaN/GaN MQWs implanted with nitrogen

Sousa, M. A., Esteves, T. C., Sedrine, N. B., Rodrigues, J., Lourenço, M. B., Redondo-Cubero, A., Alves, E., O'Donnell, K. P., Bockowski, M., Wetzel, C., Correia, M. R., Lorenz, K. & Monteiro, T., 13 Apr 2015, In : Scientific Reports. 5, 6 p., 9703.

Research output: Contribution to journalArticle

Open Access
File
luminescence
photoluminescence
nitrogen
implantation
annealing
13 Citations (Scopus)
206 Downloads (Pure)

Photoluminescence studies of a perceived white light emission from a monolithic InGaN/GaN quantum well structure

Ben Sedrine, N., Esteves, T. C., Rodrigues, J., Rino, L., Correia, M. R., Sequeira, M. C., Neves, A. J., Alves, E., Boćkowski, M., Edwards, P. R., O'Donnell, K. P., Lorenz, K. & Monteiro, T., 2015, In : Scientific Reports. 5, 7 p., 13739.

Research output: Contribution to journalArticle

Open Access
File
light emission
quantum wells
photoluminescence
annealing
color
3 Citations (Scopus)
57 Downloads (Pure)

Quantitative chemical mapping of InGaN quantum wells from calibrated high-angle annular dark field micrographs

Carvalho, D., Morales, F. M., Ben, T., García, R., Redondo-Cubero, A., Alves, E., Lorenz, K., Edwards, P. R., O'Donnell, K. P. & Wetzel, C., Aug 2015, In : Microscopy and Microanalysis. 21, 4, p. 994-1005 12 p.

Research output: Contribution to journalArticle

Open Access
File
Semiconductor quantum wells
quantum wells
Transmission electron microscopy
transmission electron microscopy
Scanning electron microscopy
5 Citations (Scopus)
rare earth elements
luminescence
temperature dependence
europium
nitrides
2014
49 Downloads (Pure)

Cathodoluminescence hyperspectral imaging of nitride semiconductors: introducing new variables

Edwards, P. R., Wallace, M. J., Kusch, G., Naresh-Kumar, G., Bruckbauer, J., Trager-Cowan, C., O'Donnell, K. P. & Martin, R. W., Aug 2014, In : Microscopy and Microanalysis. 20, S3, p. 906-907 2 p.

Research output: Contribution to journalConference Contribution

Open Access
File
14 Citations (Scopus)

Europium-doped GaN(Mg): beyond the limits of the light-emitting diode

O'Donnell, K. P., Edwards, P. R., Kappers, M. J., Lorenz, K., Alves, E. J. & Boćkowski, M. X., Apr 2014, In : Physica Status Solidi C. 11, 3-4, p. 662–665 4 p.

Research output: Contribution to journalArticle

europium
light emitting diodes
magneto-optics
exploitation
ions
10 Citations (Scopus)

Sequential multiple-step europium ion implantation and annealing of GaN

Miranda, S. M. C., Edwards, P. R., O'Donnell, K. P., Boćkowski, M., Alves, E., Roqan, I. S., Vantomme, A. & Lorenz, K., 1 Feb 2014, In : Physica Status Solidi C. 11, 2, p. 253-257 5 p.

Research output: Contribution to journalConference Contribution

europium
ion implantation
annealing
vapor phase epitaxy
hydrides
10 Citations (Scopus)
45 Downloads (Pure)

Structural dynamics of GaN microcrystals in evolutionary selection selective area growth probed by X-ray microdiffraction

Kachkanov, V. V., Leung, B. B., Song, J. J., Han, J. J., Zhang, Y., Tsai, M. C., Yuan, G., Han, J. & O'Donnell, K. K., 11 Apr 2014, In : Scientific Reports. 4, 6 p., 4651.

Research output: Contribution to journalArticle

Open Access
File
dynamic structural analysis
microcrystals
x rays
tunnels
optoelectronic devices
2013
3 Citations (Scopus)

Characterisation of III-nitride materials by synchrotron X-ray microdiffraction reciprocal space mapping

Kachkanov, V., Dobnya, I., O'Donnell, K., Lorenz, K., Pereira, S. M. D. S., Watson, I., Sadler, T., Li, H., Zubialevich, V. & Parbrook, P., Mar 2013, In : Physica Status Solidi C. 10, 3, p. 481-485 5 p.

Research output: Contribution to journalArticle

nitrides
synchrotrons
microbalances
x rays
detectors
2 Citations (Scopus)

Temperature-dependent hysteresis of the emission spectrum of Eu-implanted, Mg-doped HVPE GaN

O'Donnell, K. P., Martin, R. W., Edwards, P. R., Lorenz, K., Alves, E. & Bockowski, M., 4 Dec 2013, The Physics of Semiconductors: Proceedings of the 31st International Conference on the Physics of Semiconductors (ICPS) 2012. Ihn, T., Rössler, C. & Kozikov, A. (eds.). Vol. 1566.

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

emission spectra
hysteresis
photoluminescence
heating
damage
2012
130 Downloads (Pure)

Characterization of InGaN and InAlN epilayers by microdiffraction X-Ray reciprocal space mapping

Kachkanov, V., Dolbnya, I. P., O'Donnell, K. P., Lorenz, K., Pereira, S., Martin, R. W., Edwards, P. R. & Watson, I. M., 8 Feb 2012, In : MRS Online Proceedings Library . 1396, 6 p., mrsf11-1396-o06-11.

Research output: Contribution to journalArticle

Open Access
File
Epilayers
seeds
X rays
microbalances
Seed
15 Citations (Scopus)

High pressure annealing of Europium implanted GaN

Lorenz, K. K., Miranda, S. M. C. S. M. C., Alves, E. J. E. J., Roqan, I. S. I. S., O'Donnell, K. P. K. P. & Boćkowski, M. X. M. X., 2012, Proceedings of SPIE - The International Society for Optical Engineering: Gallium Nitride Materials and Devices VII. Vol. 8262. p. 82-87 6 p. 82620C

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

Europium
europium
Annealing
annealing
fluence
24 Citations (Scopus)
19 Downloads (Pure)

Induced magnetic moment of Eu3+ ions in GaN

Kachkanov, V. V., Wallace, M. J. M. J., Van Der Laan, G. G., Dhesi, S. S. S. S., Cavill, S. A. S. A., Fujiwara, Y. Y. & O'Donnell, K. P. K. P., 12 Dec 2012, In : Scientific Reports. 2, December, 5 p., 969.

Research output: Contribution to journalArticle

Open Access
File
magnetic moments
rare earth elements
ions
junction diodes
magneto-optics
49 Citations (Scopus)

It's not easy being green: strategies for all-nitrides, all-colour solid state lighting

O'Donnell, K. P., Maur, M. A. D., Di Carlo, A., Lorenz, K. & SORBET Consortium, Feb 2012, In : Physica Status Solidi (RRL) - Rapid Research Letters . 6, 2, p. 49-52 4 p.

Research output: Contribution to journalArticle

Nitrides
illuminating
nitrides
Light emitting diodes
Diodes
49 Citations (Scopus)
19 Downloads (Pure)

It's not easy being green: strategies for all-nitrides, all-colour solid state lighting

O'Donnell, K., Auf Der Maur, M., Di Carlo, A. & Lorenz, K., Feb 2012, In : Physica Status Solidi (RRL) - Rapid Research Letters . 6, 2, p. 49-52 4 p.

Research output: Contribution to journalArticle

File
Nitrides
illuminating
nitrides
Light emitting diodes
Diodes
1 Citation (Scopus)

Photoluminescence of Eu-doped GaN

O'Donnell, K. P. K. P., 1 Jan 2012, In : MRS Online Proceedings Library . 1342, p. 101-109 9 p.

Research output: Contribution to journalArticle

Photoluminescence
Spectroscopy
photoluminescence
Magnetooptical effects
Metallorganic vapor phase epitaxy
2011
4 Citations (Scopus)
152 Downloads (Pure)

InGaN epilayer characterization by microfocused x-ray reciprocal space mapping

Kachkanov, V., Dolbnya, I. P., O'Donnell, K., Martin, R., Edwards, P. & Pereira, S., 2011, In : Applied Physics Letters. 99, 18, 3 p., 181909.

Research output: Contribution to journalArticle

Open Access
File
seeds
edge dislocations
microbalances
x rays
11 Citations (Scopus)

The photoluminescence/excitation (PL/E) spectroscopy of Eu-implanted GaN

O'Donnell, K. P., Roqan, I. S., Wang, K., Lorenz, K., Alves, E. & Bockowski, M., May 2011, In : Optical Materials. 33, 7, p. 1063-1065 3 p.

Research output: Contribution to journalArticle

Crystal defects
Light emitting diodes
Photoluminescence
Spectroscopy
Impurities
4 Citations (Scopus)
186 Downloads (Pure)

Zeeman splittings of the 5D0–7F2 transitions of Eu3+ ions implanted into GaN

Kachkanov, V., O'Donnell, K. P., Rice, C., Wolverson, D., Martin, R. W., Lorenz, K., Alves, E. & Bockowski, M., 2011, In : MRS Online Proceedings Library . 1290, 5 p.

Research output: Contribution to journalArticle

Open Access
File
Ions
Magnetic fields
magnetic fields
ions
Photoluminescence