White light generation from the CdSe ZnS core-shell
العناوين الأخرى
توليد الضوء الأبيض من سيلينايد الكادميوم كبريتيد الزنك لب-قشرة
مقدم أطروحة جامعية
مشرف أطروحة جامعية
الجامعة
جامعة بغداد
الكلية
كلية العلوم
القسم الأكاديمي
قسم الفيزياء
دولة الجامعة
العراق
الدرجة العلمية
ماجستير
تاريخ الدرجة العلمية
2011
الملخص الإنجليزي
The CdSe/ZnS core-shell nanocrystals (NCs) were prepared by the chemical method.
The cadmium selenide was prepared as a colloidal solution from reaction of sodium selenosulfide (Na2SeSO3) and cadmium chloride (CdCl2) with gelatin solutions at 1:2 mole ratio.
The zinc sulfide was prepared by chemical reaction of zinc chloride (ZnCl2) and sodium sulfide (Na2S) at 1:1 mole ratio.
The nanocrystals dimensions and shapes are controlled by the chemical reaction time.
The structure, optical properties and the surface morphology were studied.
The optical energy gaps were determined by several techniques from the absorption spectrum and luminescence spectrum.
The values of 2.38 and 3.77 eV for CdSe and ZnS were found from the Tauce relation, whereas the energy gap values from the photoluminescence spectrum were found to be about to 2.38 and 4.00 eV for CdSe, ZnS respectively.
The generation of the white light from the CdSe/ZnS core-shell nanocrystals illuminated by GaN UV−LED is presented.
The CdSe/ZnS coreshell nanoparticles prepared by the chemical method were dispersed in Polyamide nylon to prepare the composite films.
The generation of white light was found from illumination the CdSe/ZnS core-shell composite film by UV−LED of power 5mW at wavelength (λ=365 nm).
The white light generation mechanism was analyzed depending on the colors mixing from the illuminated CdSe/ZnS core-shell nanoparticles.
The chromaticity coordinates of the generated white light was measured by the photoluminescence spectrum, which were located at x=0.40, y=0.43 and x=0.39, y=38 for colloidal and composite films of CdSe/ZnS core-shell respectively.
The correlated colour temperature was found to be about 3886 and 4105 K for colloidal and composite films of CdSe/ZnS core-shell respectively.
التخصصات الرئيسية
عدد الصفحات
93
قائمة المحتويات
Table of contents.
Abstract.
Abstract in Arabic.
Chapter One : Introduction and basic concepts.
Chapter Two : The experimental work.
Chapter Three : Results and discussion.
References.
نمط استشهاد جمعية علماء النفس الأمريكية (APA)
Kazim, Aqil Mahdi. (2011). White light generation from the CdSe ZnS core-shell. (Doctoral dissertations Theses and Dissertations Master). University of Baghdad, Iraq
https://search.emarefa.net/detail/BIM-607604
نمط استشهاد الجمعية الأمريكية للغات الحديثة (MLA)
Kazim, Aqil Mahdi. White light generation from the CdSe ZnS core-shell. (Doctoral dissertations Theses and Dissertations Master). University of Baghdad. (2011).
https://search.emarefa.net/detail/BIM-607604
نمط استشهاد الجمعية الطبية الأمريكية (AMA)
Kazim, Aqil Mahdi. (2011). White light generation from the CdSe ZnS core-shell. (Doctoral dissertations Theses and Dissertations Master). University of Baghdad, Iraq
https://search.emarefa.net/detail/BIM-607604
لغة النص
الإنجليزية
نوع البيانات
رسائل جامعية
رقم السجل
BIM-607604
قاعدة معامل التأثير والاستشهادات المرجعية العربي "ارسيف Arcif"
أضخم قاعدة بيانات عربية للاستشهادات المرجعية للمجلات العلمية المحكمة الصادرة في العالم العربي
تقوم هذه الخدمة بالتحقق من التشابه أو الانتحال في الأبحاث والمقالات العلمية والأطروحات الجامعية والكتب والأبحاث باللغة العربية، وتحديد درجة التشابه أو أصالة الأعمال البحثية وحماية ملكيتها الفكرية. تعرف اكثر
