Title of article :
Manifested luminescence and magnetic responses of stoichiometry dependent Cd1 − xMnxSe quantum dots
Author/Authors :
Sarma، نويسنده , , Runjun and Deka، نويسنده , , Geetamoni and Mohanta، نويسنده , , Dambarudhar، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2015
Abstract :
We report on stoichiometry dependent manifested physical properties of thioglycolic acid (TGA) coated Cd1 − xMnxSe QDs. While possessing a wurtzite phase, with increasing x, the QDs exhibited a notable blue-shifting of the onset of absorption. Attributed to VCd–VSe di-vacancies, the QDs describe an intense deep-defect related emission response at smaller values of x (=0 to 0.3). Due to the facilitation of magnetic Mn2+ ion migration from the core to the QD surfaces, 4T1–6A1 transition based Mn2+ orange emission get suppressed at a higher x (=0.6 to 1). While the FT-IR spectra of the alloyed QDs display characteristic Mn–OH stretching mode at ∼644 cm−1, the peak located at ∼703 cm−1 is assigned to Cd-Se bending. Furthermore, the QDs with a low x (=0.3), exhibit paramagnetic characteristics owing to the presence of uncorrelated, isolated Mn2+ spins. The collective luminescence and magnetic features would find immense scope in bio-labeling and imaging applications, apart from solid state luminescent components.
Keywords :
A. Semiconductors , C. Raman spectroscopy , D. Magnetic properties , D. Luminescence , A. Nanostructures , B. Chemical synthesis , D. Crystal structure , C. X-ray diffraction , A. Chalcogenides
Journal title :
Materials Research Bulletin
Journal title :
Materials Research Bulletin