Find Research Outputs

Search in all content

Filters for Research Output

Search concepts
Selected filters

Publication Year

  • 2020
  • 2019
  • 2018
  • 2017
  • 2016
  • 2015
  • 2014
  • 2013
  • 2012
  • 2011

Author

  • Kevin O'Donnell

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
5 Citations (Scopus)
186 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
5 Citations (Scopus)
25 Downloads (Pure)
5 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

11 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

3 Citations (Scopus)

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
10 Citations (Scopus)
45 Downloads (Pure)

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

11 Citations (Scopus)

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
6 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
3 Citations (Scopus)
58 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
13 Citations (Scopus)
206 Downloads (Pure)

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

1 Citation (Scopus)

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
17 Citations (Scopus)
75 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
5 Citations (Scopus)
31 Downloads (Pure)

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

50 Citations (Scopus)

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
50 Citations (Scopus)
19 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
4 Citations (Scopus)
152 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
27 Citations (Scopus)
19 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
1 Citation (Scopus)
79 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
7 Citations (Scopus)
78 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
10 Downloads (Pure)

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

16 Citations (Scopus)

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
3 Citations (Scopus)
9 Downloads (Pure)

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

15 Citations (Scopus)

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
4 Citations (Scopus)
27 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
19 Citations (Scopus)
122 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
3 Citations (Scopus)
145 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
130 Downloads (Pure)

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

3 Citations (Scopus)

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
49 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
4 Citations (Scopus)
15 Downloads (Pure)

Acceptor state anchoring in gallium nitride

Cameron, D., O'Donnell, K. P., Edwards, P. R., Peres, M., Lorenz, K., Kappers, M. J. & Boćkowski, M., 9 Mar 2020, In : Applied Physics Letters. 116, 10, 4 p., 102105.

Research output: Contribution to journalArticle

Open Access
File
5 Downloads (Pure)