The effect of dopant and optical micro-cavity on the photoluminescence of Mn-doped ZnSe nanobelts

Abstract

Pure and Mn-doped ZnSe nanobelts were synthesized by a convenient thermal evaporation method. Scanning electron microscopy, X-ray powder diffraction, energy dispersive X-ray spectroscopy and corresponding element mapping, and transmission electron microscope were used to examine the morphology, phase structure, crystallinity, composition, and growth direction of as-prepared nanobelts. Raman spectra were used to confirm the effective doping of Mn2+ into ZnSe nanobelts. Micro-photoluminescence (PL) spectra were used to investigate the emission property of as-prepared samples. A dominant trapped-state emission band is observed in single ZnSeMn nanobelt. However, we cannot observe the transition emission of Mn ion in this ZnSeMn nanobelt, which confirm that Mn powder act as poor dopant. There are weak near-bandgap emission and strong 4T1 → 6A1 transition emission of Mn2+ in single ZnSenormalMnCl2 and normalZnSeMn(CH3COO)2 nanobelt. More interesting, the 4T1 → 6A1 transition emission in normalZnSeMn(CH3COO)2 nanobelt split into multi-bands. PL mapping of individual splitted sub-bands were carried out to explore the origin of multi-bands. These doped nanobelts with novel multi-bands emission can find application in frequency convertor and wavelength-tunable light emission devices.

Tunability in the Optical and Electronic Properties of ZnSe Microspheres via Ag and Mn Doping

“…The appearance of the rodlike structure is attributed to the change in the content and concentration of reducing agent. 21−23 For the Mn:ZnSe sample, as shown in Figure 1d, ZnSe doped with Mn also shows a spherical shape. Compared with the morphology of pure ZnSe, the only difference is that the surface of Mn-doped ZnSe microspheres is much rougher.…”

“…The reaction of hydrazine hydrate and silver nitrate in the solution act as an effective source of the Ag element, N 2 H 4 ·H 2 O and AgNO 3 first react and to form the Ag element, resulting in a decrease in the content and concentration of free Ag + and hydrazine hydrate in the solution. The appearance of the rodlike structure is attributed to the change in the content and concentration of reducing agent. − For the Mn:ZnSe sample, as shown in Figure d, ZnSe doped with Mn also shows a spherical shape. Compared with the morphology of pure ZnSe, the only difference is that the surface of Mn-doped ZnSe microspheres is much rougher.…”

Photoluminescence and Boosting Electron–Phonon Coupling in CdS Nanowires with Variable Sn(IV) Dopant Concentration

“…Clearly, aggregation itself represents a nonlinear correlation between excitons and leads to giant oscillator strength, yielding nonlinear optical responses [ 30 , 31 ]. For imperfect nanomaterial with plenty of impurities or defects, the impurities or defects-induced crystal deformation can remarkably modify the electron–phonon coupling and always induces n LO phonon-assisted emission, in addition to the near band gap emission [ 32 – 34 ]. This multi-phonon emission profile is similar to the high-order stimulated Raman processes in a silica fiber and their difference lies in the real state contribution for the emission band.…”

Synthesis of ZnSe Nanocrystals for Solid-state Lighting Applications

“…4 shows Raman spectra of synthesized ZnSe NCs with different Zn:Se molar ratios (0.5:1÷1.5:1). Raman diffraction peaks were observed at 138 cm −1 , 203 cm −1 and 250cm −1 , corresponding to 2TA, TO and LO phonon modes respectively [46][47][48]. The absence of Raman mode at 290 cm −1 may be related to lattice defects [48].…”

“…Raman diffraction peaks were observed at 138 cm −1 , 203 cm −1 and 250cm −1 , corresponding to 2TA, TO and LO phonon modes respectively [46][47][48]. The absence of Raman mode at 290 cm −1 may be related to lattice defects [48]. The coexistence of TO and LO modes prove good quality of the synthesized ZnSe NPs, which is in accordance with the results obtained from the above XRD and HR-TEM studies.…”