Growth and properties of hydrothermally derived crystalline ZnSe quantum dots
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Growth and properties of hydrothermally derived crystalline ZnSe quantum dots Insaaf Assadullah 1 & M Burhanuz Zaman 2 Radha Tomar 1
&
Khurshaid Ahmad Malik 1 & Javied Hamid Malik 1 & Aadil Ahmad Bhat 1 &
Received: 14 February 2020 / Accepted: 27 September 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Chalcogenide nanostructures are the materials with diverse applications. Here, we report rapid hydrothermal synthesis of crystalline ZnSe quantum dots (QDs), avoiding the use of toxic chemicals. To the best of our knowledge, this is the first report on very rapid (5 h) hydrothermal synthesis of pristine ZnSe QDs. Elemental selenium is used as a source for selenium. Structural, morphological, compositional, and optical properties of the semiconductor were studied. Structural properties (X-ray diffraction) demonstrate that the particles have grown in a single cubic phase. Morphological studies show formation of agglomerated QDs (4 nm). The material possess stoichiometric ratio of the constituent elements that are uniformly distributed. Selected area electron diffraction (SAED) study indicated the material is polycrystalline in nature. Optical properties demonstrated that the QDs are suitable for optoelectronic devices exhibiting room temperature photoluminescence. Commission Internationale de l’Éclairage (CIE) chromaticity diagram shows the material exhibits violet emission and hence suitable for violet LEDs that have potential ability in clinical applications. Keywords Rapid hydrothermal synthesis . ZnSe . Quantum dots . Photoluminescence . Responsible Editor: Philippe Garrigues
Introduction Quantum dots (QDs) also known as zero dimensional (0 D) structures have two surplus advantages: their band gap can be modified by changing the size of the QDs and they can generate multiple charge carriers with a single high energy photon absorbance. QDs are a novel class of fluorescent materials that has gained tremendous popularity globally and has emerged as a new class of optoelectronic materials. QDs have proved very beneficial in the field of environmental remediations either by acting as photocatalysts or antipathogens. Metal chalcogenide QDs have attracted great attention due to their quantum confinement and size-dependent photoemission Responsible Editor: Philippe Garrigues * M Burhanuz Zaman [email protected] 1
School of Studies in Chemistry, Jiwaji University, Gwalior 474011, India
2
School of Studies in Physics, Jiwaji University, Gwalior 474011, India
properties. CdTe and CdSe have been extensively used for such type of applications. CdSe and CdTe QDs have been used to photodegrade various industrial dyes and antibiotics which cause environmental pollution, otherwise very difficult to decompose (Men et al. 2019; Mahmoodi et al. 2015; Thirugnanam et al. 2017; Liu et al. 2013; Akbari et al. 2020; Liu et al. 2019; Bajorowicz et al. 2017). Although, these QDs are exceptionally good in such type of applications, the presence
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