نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه شیراز بخش فیزیک

2 دانشگاه شیراز

3 بخش شیمی / دانشگاه شیراز

4 بخش شبمی/دانشگاه شیراز

چکیده

نقاط کوانتومی (QDs) کالکوژن روی (ZnS) آلاییده با یون‌های پارامغناطیس فلزات واسطه (به ویژه Mn)، نانوبلورهای نیمه‌رسانای جدید، جذاب و کمتر بررسی شده‌ای هستند که خواص اپتیکی عالی و پایداری محیطی و گرمایی بهبودیافته‌ای در مقایسه با نقاط کوانتومی بر پایه کادمیوم دارند. در این مقاله، ما با استفاده از نقاط کوانتومی ZnS:Mn حل شده در محلول رنگی RhB ، امکان ساخت یک لیزر کاتوره‌ای بر پایه نقاط رنگی با بازخورد غیر تشدیدی را اثبات می‌کنیم. تغییرات غیرخطی طیف نشری برحسب انرژی برانگیختگی حکایت از یک آستانه لیزینگ کاتوره‌ای دارد. علاوه بر این، با افزایش تراکم پراکننده‌ها، ما یک جابجایی آبی به اندازه nm 10/3 در طول موج نشری و یک کاهش با ضریب 5/3 در آستانه RL مشاهده می‌کنیم. ما همچنین یک بحث نظری بر پایه نظریه پخش برای توضیح نتایج آزمایشگاهی مشاهده شده ارائه می‌کنیم

کلیدواژه‌ها

عنوان مقاله [English]

Fabrication of a dye-based random laser using ZnS:Mn quantum dots and investigating the effects of their concentration

نویسندگان [English]

  • A Ghasempour Ardakani 1
  • P Rafieipour 2
  • M J Samimipour 3
  • J Tashkhourian 4

1 Department of Physics, College of Science, Shiraz University, Shiraz, Iran

2 Department of Physics, College of Science, Shiraz University, Shiraz, Iran

3 Department of Physics, College of Science, Shiraz University, Shiraz, Iran

4 Department of Physics, College of Science, Shiraz University, Shiraz, Iran

چکیده [English]

Zinc chalcogenide quantum dots (QDs) doped with paramagnetic transition metal ions (particularly ZnS:Mn QDs) are new attractive but rarely examined semiconductor nanocrystals that have excellent optical properties and enhanced thermal and environmental stability compared to Cd-based QDs. In this paper, we demonstrate a dye-based random laser (RL) with nonresonant feedback using ZnS:Mn QDs as the scattering medium that are dispersed in a Rhodamine B (RhB) dye solution. The nonlinear variation of the emission spectrum as a function of the excitation energy implies a random lasing threshold. Moreover, we observe a blue-shift of the emission wavelength by 10.3 nm and a 5.3 times decrease in the RL threshold by increasing the scatterer concentration. We also provide a theoretical discussion based on the diffusion theory for explaining the observed experimental results.
 

کلیدواژه‌ها [English]

  • Mn doped ZnS quantum dots
  • multiple light scattering
  • random lasers
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