Abstract
GaN:Mn epilayers were grown on Al2O3 substrate uisng molecular beam epitaxy (MBE) and were subsequently implanted with Mn+ ions (1% and 10%). Photoluminescence (PL) with 1% of Mn showed that optical transitions related to Mn revealed the donor-Mn pair (D, Mn) at 2.5 eV and the electron-Mn pair (e, Mn) around 3.1 eV, and yellow luminescence (YL) around 2.20-2.25 eV. Photoluminescence (PL) with 10% of Mn showed the same but enhanced optical transitions as above. However, the new transitions around 1.65 eV for the sample with 10% which did not appeared with Mn of 1% were very weakly produced. The results of cathode-luminescence (CL) with 10% of Mn showed transitions related to Mn in PL together with new transitions around 1.72 eV. However, the new transitions around 1.72 eV for the sample with 10% according to high accelerating voltage were very remarkably activated in contrast with PL transitions which appeared were very weakly produced in samples with Mn of 10%. Transitions around 1.72 eV in CL correspond to though around 1.65 eV in PL. This result means that deep donor (probably, VN) is detected with increasing accelerating voltage and Mn-VN complex is formed. This is supported by strong electron beam sensitivity of the IR emission bands. It is well known that heavy Mn doping (>∼1019 C m-3) leads to a downshift of the Fermi level and promotes the formation of defect complexes of Mn-VN. In our case, Mn doping concentration is >∼1021 C m-3. Therefore, it is conjectured that the CL transition around 1.72 eV corresponds to Mn-VN complex.
Original language | English |
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Article number | 13530 |
Pages (from-to) | 288-292 |
Number of pages | 5 |
Journal | Journal of Luminescence |
Volume | 168 |
DOIs | |
Publication status | Published - 2015 Aug 5 |
Bibliographical note
Funding Information:This work was supported by the National Research Foundation of Korea (NRF) Grant funded by Ministry of Education, Science and Technology (MEST) (Nos. NRF-2014R1A2A2A01007718 , NRF-2014-066298 , NRF-2014R1A2A1A11053936 , NRF-2013R1A1A2008875 , and NRF-2015R1A2A2A01004782 ) and by the Quntum-functional Research Center (QSRC) of Dongguk University and supported from the KIST Institutional Programme , including the Dream Project, the Converging Research Center Programme through the MEST ( 2012K001280 ).
Publisher Copyright:
© 2015 Elsevier B.V.
Keywords
- Cathode-luminescence (CL)
- GaMnN
- Photoluminescence (PL)
ASJC Scopus subject areas
- Biophysics
- Atomic and Molecular Physics, and Optics
- General Chemistry
- Biochemistry
- Condensed Matter Physics