Photoluminescence and resonant Raman scattering in CdIn2S4 and ZnIn2S4

Abstract

Photoluminescence emission and exitation spectra of CdIn,S, and ZnIn,S, spinels are recorded. Both materials have two emission bands in the red spectral region a t 1.52 and 1.89 eV for CdIn,S, and a t 1.52 and 1.29 eV for ZnIn,S,. The excitation maxima for these bands are respectively a t photon energies 2.18 and 2.5 eV for CdIn,S, and 2.14 and 2.35 eV for ZnIn,S,. Additionally, for Cdln,S4 two narrow emission lines in the green spectral region a t 2.39 and 2.52 eV are found. The nature of the recombination centres is discussed. The Raman scattering cross section is measured for several Raman lines as a function of the photon energy of the exciting light. The Alg and F1, modes are found to undergo a resonant enhancement while the E, modes exhibited an antiresonance behaviour. The resonance maxima are located close to the values of the photoluminescence excit,ati.on maxima. Photolumineszenz-Emissionsund Anregungsspektren vori CdIn,S,-und ZnIn&SpineHen werden aufgenommen. Beide Materialien zeigen zwei Emissionsbande im roten Spektralbereich bei 1,52 und 1,89 eV im Falle des CdIn,S, und bei 1,29 und 1,52 eV fur ZnIn,S,. Die dazugehorenden Anregungsmaxima befinden sich bei E,, = 2,18 und 2,5 eV fur CdIn,S, urid bei 2,35 und 2,14 eV fiir ZnIn,S,, wobei E, die Photonenenergie des anregenden Lichtes ist. AuIlerdem werden im grunen Spektralbereich zwei schmale Emissionsbanden bei 2,39 und 2,52 eV gefunden. Die Natnr der Rekombinationszentren wird diskutiert. Gemessen wird auch die Abhangigkeit des Streuquerschnittes mehrerer Raman-Linien von E,. A1,-und Fl,-Moden zeigen Resonanzen, uahrend E,-Moden Antiresonanzen aufweisen. Die Resonanzmaxima liegen bei fast den gleichen Photoneneiiergien wie die Maxima der Photolumineszenzanregung.

Morphology, structure and photocatalytic performance of ZnIn2S4 synthesized via a solvothermal/hydrothermal route in different solvents

“…2a that there are four Raman peaks around 257, 303, 346 and 370 cm À1 in the spectra of ZnIn 2 S 4 prepared in aqueous-mediated condition (ZIS-H 2 O). Compared to the predicted data of the ZnIn 2 S 4 crystal [32,33], we can, respectively, assign the peaks around 257, 303 and 346 cm À1 to the longitudinal optical mode (LO 1 ), transverse optical mode (TO 2 ) and longitudinal optical mode (LO 2 ), resulting from the long-wavelength lattice vibrations of ZnIn 2 S 4 . The transverse optical mode (TO 1 ) of ZnIn 2 S 4 was not observed in the present ZIS-H 2 O product.…”

Controlled syntheses of cubic and hexagonal ZnIn2S4 nanostructures with different visible-light photocatalytic performance

“…The PL spectrum shows peaks at 826 nm when excited at 579 nm and suggests that Zn 2+ ions occupy some or all of the octahedral In 3+ sites in spinel ZnIn 2 S 4 . 26 Although Zn 2+ ions can occupy some of the octahedral coordination sites and result in mix or inverse spinel ZnIn 2 S 4 , the This journal is © The Royal Society of Chemistry 2011 maximum amount of octahedral sites that Zn 2+ can occupy is half of the total B sites in spinel AB 2 O 4 . When InCl 3 is used as the precursor, due to the lower electronegativity of the chloride, the majority of In 3+ is tetrahedrally coordinated.…”

Facile synthesis and size-dependent optical properties of luminescent ZnIn2S4 nanocrystals derived from metal xanthates

“…47 The Raman phonon modes seen at 271, 312, and 339 cm À1 may be assigned to F 1u symmetry and are Raman forbidden, however, the assignment was justified by Unger et al by considering the modes as Fro ¨hlich electron-phonon interaction and deformation potential scattering. 48 The homogeneous distribution of the constituent elements within the nanocrystals was further corroborated by 2-D elemental mapping (Fig. S5, ESI †).…”