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Journals / Politeknik Dergisi / 2021 / Cilt: 24 - Sayı: 1

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

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

Musa ÇADIRCI
Tuna DEMİRCİ
Pages
25–30
DOI
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

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.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:Semiconductor quantum dots have wide application areas as they have unique electrical and optical properties.
📊
Key Findings & Data:As a result, the difference between 2S-1P absorption transitions did not change with particle size.
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Conclusion & Impact: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.
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:Domain Parameters

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.

Özet

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 metotlarıyla aydınlatıldı. Sonuç olarak bakıldığında 2S ile 1P absorbsiyon geçişleri arasındaki farkın parçacık boyutu ile değişmediği fakat 1S ile 2S ve 1S ile 1P geçişleri arasındaki farkın parçacık büyüklüğü ile ters orantılı olduğu gözlemlendi. En küçük numunenin fotolüminesans spektrumunun FWHM değeri 25 nm’ye kadar düştüğü ve Stokes kayma miktarlarının 0.06 eV olduğu gözlemlendi.

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Cite This Article

ÇADIRCI, M., DEMİRCİ, T. (2021). Synthesis of Highly Monodisperse CdSe Quantum Dots and Size Dependency of Optical Properties. Politeknik Dergisi, Cilt: 24 - Sayı: 1, 25–30. https://ajindex.com/articles/306276

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