Angadi, Basavaraj Kumar, Ravi Park, Dong-Hee Choi, Ji-Won Choi, Won-Kook 2024-01-20T15:31:29Z 2024-01-20T15:31:29Z 2021-09-05 2012-02-01 0168-583X https://pubs.kist.re.kr/handle/201004/129551 The temperature dependant photoluminescence of the Co-doped ZnO thin films, prepared by ion implantation on the MBE grown ZnO thin films followed by swift heavy ion irradiation, were investigated. The phenomenon of negative thermal quenching (NTQ), where the photoluminescence (PL) intensity increases with temperature, in contrast to the usual behavior of decrease in intensity with temperature, has been observed. The I-3 peak and the peaks (a, 6, c, d, and e), corresponding to t(2g) and e(g) levels of the crystal field split Cod orbitals exhibit the NTQ behavior. The NTQ temperature range 35-45 K observed in un-doped ZnO shifts towards lower temperature with the Co doping. The increased number of dopant related and/or the vibrational/rotational resonance states with lower activation energies, from which the thermal excitation of the electrons takes place to the initial state of the PL transition, are responsible for the NTQ behavior. (C) 2011 Published by Elsevier B.V. English ELSEVIER SCIENCE BV MOLECULAR-BEAM EPITAXY DONOR-ACCEPTOR BOUND-EXCITON FERROMAGNETISM LUMINESCENCE EMISSION TEMPERATURE ABSORPTION BAND Photoluminescence studies on MBE grown Co-doped ZnO thin films fabricated through ion implantation and swift heavy ion irradiation Article 10.1016/j.nimb.2011.01.088 1 NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS, v.272, pp.305 - 308 NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS 272 305 308 scie scopus 000301159900070 2-s2.0-84655168067 Instruments & Instrumentation Nuclear Science & Technology Physics, Atomic, Molecular & Chemical Physics, Nuclear Instruments & Instrumentation Nuclear Science & Technology Physics Article; Proceedings Paper MOLECULAR-BEAM EPITAXY DONOR-ACCEPTOR BOUND-EXCITON FERROMAGNETISM LUMINESCENCE EMISSION TEMPERATURE ABSORPTION BAND DMS ZnO Photoluminescence Swift heavy ion