Green luminescence band

This paper reports on the temperature-dependent photoluminescence of porous GaP under the 355-nm excitation. Porous GaP was formed by electrochemical anodization of the (111)-oriented bulk material. Photoluminescence taken from the porous GaP at room temperature shows a narrow green emission band peaking at 550 nm (2.25 eV) and a broad red emission one peaking at 770 nm (1.65 eV).

7p vidonut2711 08-11-2019 8 0   Download

By doping of Cu2+ ion, the absorption wavelength is shifted towards the lower wavelength being an evidence for an increasing band gap. The emission spectrum of pure ZnS has a green emission band centred at around 520 nm. By doping Cu2+ ion, the peak of the green band in the luminescence spectra were transferred to 516 nm and appeared a strong blue peak at 440 nm. The reasons of these will be discussed in this paper.

7p cathydoll4 21-02-2019 22 1   Download

In this paper, materials of ZnS:Cu, ZnS:Mn and ZnO:Co were prepared by ceramic method and co-precipitated method. The presence of transition metals such as Cu2+(3d9), Mn2+(3d5) in ZnS and Co2+(3d7) in ZnO make blue bands at around 476 nm, 486 nm and green band at around 514 nm disappeared. Simultaneously, there are luminescence bands at around 533 nm, 582 nm, 693 nm for bulk samples of ZnS:Cu, ZnS:Mn, ZnO:Co and 603 nm for nanocrystalline sample of ZnS:Mn.

7p tuanlocmuido 19-12-2012 59 3   Download