Yüksek Oranda Eş Parçacık Boyutlu CdSe Kuantum Noktaların Sentezi ve Optiksel Özelliklerinin Parçacık Boyutlarına Bağlılığı

Year 2021, Volume: 24 Issue: 1, 25 - 30, 01.03.2021

Musa Çadırcı Tuna Demirci

https://doi.org/10.2339/politeknik.639950

Cited By: 1

Abstract

Benzersiz
elektriksel ve optik özelliklerinden dolayı yarıiletken kuantum noktalar birçok
uygulama alanına sahiptirler. Son yıllarda CdSe kuantum noktalar en fazla
tercih edilen nanomalzemelerin başında yer almaktadır. Sıcak enjeksiyon
metodunu kullanarak yüksek oranda eş parçacık boyutuna sahip ve altıgen tip bir
simetriye sahip çinko blend kristal tipinde CdSe kuantum noktalar sentezlendi.
Elde edilen numunelerin yapıları ve özellikleri UV-Vis, fotolüminesans, XRD ve
TEM karakterizasyon metodlarıyla aydınlatıldı. 1S, 2S ve 1P absorbsiyon
geçişleri ve Stoke kayma miktarlarının malzeme boyutlarıyla olan ilişkileri
incelendi.

Keywords

CdSe, Kuantum nokta, sıcak enjeksiyon, optik soğurma, fotolüminesans, nanoteknoloji

Supporting Institution

Düzce Üniversitesi BAP

Project Number

2017.06.03.592

Synthesis of Highly Monodisperse CdSe Quantum Dots and Size Dependency of Optical Properties

Abstract

Semiconductor quantum dots have wide application areas as they have unique electrical and optical properties. In recent years, CdSe quantum dots are one of the most preferred nanomaterials. Highly monodisperse zinc blend CdSe quantum dots were synthesized using hot injection method. The structure and optical properties of the samples were determined by UV-Vis, photoluminescence, XRD and TEM methods. As a result, the difference between 2S-1P absorption transitions did not change with particle size. However, the difference between 1S-2S and 1S-1P transitions were found to be inversely proportional to particle size.  The FWHM value of the photoluminescence spectrum of the smallest sample has decreased to 25 mm and Stokes shifts were observed to be 0.06 eV.

Keywords

CdSe, Quantum Dot, hot injection, optical absorption, photoluminescence, nanotechnology

Project Number

2017.06.03.592

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