Is the Lack of Orange Emission Infallible Proof of Unsuccessful Doping of Mn in Quantum Dots?

2021 ◽  
Author(s):  
Payel Mondal ◽  
Sowmeya Sathiyamani ◽  
Kushagra Gahlot ◽  
Ranjani Viswanatha
Keyword(s):  
Quantum Dots ◽  
Orange Emission

Mn2+ ion influenced optical and photocatalytic behaviour of Mn–ZnS quantum dots prepared by a microwave assisted technique

RSC Advances ◽  
2014 ◽  
Vol 4 (84) ◽  
pp. 44592-44599 ◽  
Author(s):  
S. Joicy ◽  
R. Saravanan ◽  
D. Prabhu ◽  
N. Ponpandian ◽  
P. Thangadurai
Keyword(s):  
Quantum Dots ◽  
Light Emission ◽  
Blue Emission ◽  
Photon Absorption ◽  
Electron Trapping ◽  
Microwave Assisted ◽  
Orange Emission ◽  
Interstitial Zinc ◽  
Sulfur Emission ◽  
Emission Quenching

(a) Photon absorption and exciton formation, (b) interstitial sulfur emission, (c) interstitial zinc emission, (d) blue emission, (e) electron trapping by Mn ions' d state, (f) orange light emission and (g) orange emission quenching by electrons trapped by the neighbouring Mn2+ ions.

Luminescence Properties of ZnS:Mn Quantum Dots

2007 ◽  
Vol 31 ◽  
pp. 167-169 ◽  
Author(s):  
Xiao Song Zhang ◽  
Lan Li ◽  
Dong Qing Dong ◽  
Zhi Wang ◽  
Xiao Yi Dong
Keyword(s):  
Quantum Dots ◽  
Aqueous Medium ◽  
Picosecond Laser ◽  
Luminescence Properties ◽  
Photoluminescence Spectra ◽  
Orange Emission ◽  
Construction Morphology

ZnS:Mn quantum dots were prepared in the aqueous medium from readily available precursors. The construction, morphology and luminescence properties of the ZnS:Mn quantum dots were evaluated by XRD,TEM and photoluminescence spectra. The blue and orange emission of the ZnS:Mn quantum dots excited by a 532nm picosecond laser were discussed.

Enhanced orange emission of Zn0.98 –XMn0.02CoxS (x = 0≤0.02) quantum dots

2022 ◽  
Vol 160 ◽  
pp. 110370
Author(s):  
P.J. Binu ◽  
S. Muthukumaran ◽  
Rane Caroleena Ganesh ◽  
P. Sakthivel
Keyword(s):  
Quantum Dots ◽  
Orange Emission

Nanostructure of semiconductor quantum dots in a borosilicate glass matrix by complementary use of HREM and AEM

1990 ◽  
Vol 48 (4) ◽  
pp. 728-729
Author(s):  
M.J. Kim ◽  
L.C. Liu ◽  
S.H. Risbud ◽  
R.W. Carpenter
Keyword(s):  
Quantum Dots ◽  
Borosilicate Glass ◽  
Glass Matrix ◽  
Optical Switching ◽  
Response Times ◽  
Fast Response ◽  
Processing Technique ◽  
Internal Stresses ◽  
Electron Hole ◽  
Spatial Dimensions

When the size of a semiconductor is reduced by an appropriate materials processing technique to a dimension less than about twice the radius of an exciton in the bulk crystal, the band like structure of the semiconductor gives way to discrete molecular orbital electronic states. Clusters of semiconductors in a size regime lower than 2R {where R is the exciton Bohr radius; e.g. 3 nm for CdS and 7.3 nm for CdTe) are called Quantum Dots (QD) because they confine optically excited electron- hole pairs (excitons) in all three spatial dimensions. Structures based on QD are of great interest because of fast response times and non-linearity in optical switching applications.In this paper we report the first HREM analysis of the size and structure of CdTe and CdS QD formed by precipitation from a modified borosilicate glass matrix. The glass melts were quenched by pouring on brass plates, and then annealed to relieve internal stresses. QD precipitate particles were formed during subsequent "striking" heat treatments above the glass crystallization temperature, which was determined by differential thermal analysis.

Attenuation of surface acoustic waves by quantum dots

1998 ◽  
Vol 77 (5) ◽  
pp. 1195-1202
Author(s):  
Andreas Knabchen Yehoshua, B. Levinson, Ora
Keyword(s):  
Quantum Dots ◽  
Acoustic Waves ◽  
Surface Acoustic Waves
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