Growth and photoluminescence properties of CdS solid solution semiconductor

Abstract

Photoluminescence (PL) emitted from Cd1‐xZnxS and CdS1‐ySey solid solution semiconductor was significantly stronger than PL from the pure CdS and CdSe semiconductor. The samples were prepared using an improved Se‐S‐Na2S flux route. Photoluminescence in Cd1‐xZnxS crystal was brightly yellow at the room temperature under VU radiation. The phase and composition of the solid solution was measured by the XRD and was confirmed by UV‐NIS spectrum as x of 0.3 and y of 0.2. The enhanced photoluminescence was presumably due to the introduction of extra defect (vacancies) by solid solution action and consequently the increasing of luminescence center concentration. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

CdS-sensitized TiO2 in phenazopyridine photo-degradation: Catalyst efficiency, stability and feasibility assessment

“…Calcination at 350 • C does not convert Rutile into the less stable Anatase [23][24][25][26]. Deposition of CdS onto sand/TiO 2 particles was then performed as described in literature [6,14,[18][19][20][21][22]. Values TiO 2 and CdS uptakes in 3 were 5.0% and 0.41% by mass, respectively.…”

“…Preparation of system 2 was performed by deposition of CdS particles onto commercial TiO 2 powders as described in literature [6,14,[17][18][19][20][21][22]. Supporting 2 onto insoluble sand particles to yield sand/TiO 2 /CdS, 3, was performed via two different approaches, as described in a preceding report [14].…”

Mechanism of Photoluminescence in Erbium-Doped Chalcogenide

“…The occurrence of recombination PL that is characterized by wide emission bands in the visible, rarely in the infrared range, is quite often found in singlecrystalline chalcogenide semiconductors at room temperature or low temperatures [19,20]. From the application viewpoint of laser technology and telecommunications, the introduction of erbium to such materials has significant advantages since the emission bands of erbium-doped glasses and single crystals are usually intense and narrow.…”

Synthesis and Characterizations of Bare CdS Nanocrystals Using Chemical Precipitation Method for Photoluminescence Application

“…Thus, the weak PL emission indicates a lack of luminescence centers. However, as the ratio of Cd 2+ is increased, the amount of sulfur vacancies are also increased which could explain that the luminescence intensity is also strongly enhanced [38]. S 2− vacancies can act as a deep trap for photogenerated electrons in the conduction band, resulting in the red luminescence of CdS through transfer to surface molecules or to pre-existing trapped holes [4].…”