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In recent years, the research on the light emission of nano-rod heterojunctions has appeared one after another. Especially, its band edge emission not only depends on its intrinsic energy band structure, but also is regulated by phonons. With the aid of phonons, the dark state of the original transition forbidden may turn into the bright state allowed by the transition, forming a new emission peak, and thus discovering a variety of novel phenomena with edge emission. The nanocrystalline phonons mainly have optical phonons and acoustic phonons. Optical phonons are mainly determined by the interaction between nanocrystallites, and acoustic phonons depend heavily on the shape and size of the nanocrystallites. Due to the low frequency and weak intensity of acoustic phonons, there are few studies on nanocrystallites and their heterojunctions.
Raman spectroscopy is an important technique to characterize the phonon vibration spectrum. In recent years, Tan Pingheng, the State Key Laboratory of Semiconductor Superlattices, Institute of Semiconductors, Chinese Academy of Sciences, and Roman Krahne, Professor of the Italian Institute of Technology, have used the research team's own ultra-low growth with the support of Wang Jiacheng, the Chinese Academy of Sciences, to take the lead in the talent plan of the Lu Jiaxi International Innovation Team. Wavenumber Raman technique systematically studies ultra-low frequency quantum confined acoustic phonons of CdSe/CdS nanorod heterojunctions under non-resonant conditions.
They found that the acoustic phonon of the nano-rod heterojunction mainly includes a stretching mode (2 cm-1~10 cm-1) and a radial breathing mode (10 cm-1~20 cm-1), which is related to nanorods. The acoustic mode is similar, but the radial respiration mode of the heterojunction shows a significant red shift (2-3 cm-1) compared to the corresponding size nanorods, and the red shift amount increases with the size of the nano-dots in the heterojunction. increase. The finite element simulation results show that the red shift is mainly caused by the localization of the breathing pattern caused by the nano-dots. The non-locality of the telescopic mode makes this redshift effect significantly diminished. Further studies have shown that the reduction of the average acoustic velocity introduced by the nanodots is the direct cause of the radial redshift of the heterojunction quantum dots. In the improved Lamb theory, the effective acoustic velocity is introduced, and the effective volume of the change in acoustic velocity can be basically the same as the size of the nano-dots, further verifying the locality of the respiratory vibration in the heterojunction.
The study also found that by adjusting the position of the nano-dots, the vibrational frequency and amplitude distribution of respiratory patterns can also be controlled. For CdSe/CdS type I heterojunctions, the absorption is mainly determined by the CdS rods, and the light emission is localized at the CdSe nanospheres, that is, the local location of the acoustic mode is the same as the optical transition position. Therefore, this provides the possibility of controlling the acoustic phonon-assisted optical transition properties of the nanorod heterojunction by adjusting the nanoparticle size and position, and is of important reference significance for studying the light emission properties of the point rod heterojunction.
The research work has also received strong support from the National Natural Science Foundation of China. The relevant research results were recently published online in Nano Letters, an academic publication of the American Chemical Society. Mario Miscuglio and Lin Miaoling are the co-first authors of the article, Tan Pingheng and Roman Krahne are co-corresponding authors of the article.
(Original title: Progress made by semiconductors, etc. in ultra-low frequency Raman spectroscopy of nano-rod heterojunctions)
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ã€China Instrument Network Instrumentation Development】 Colloidal semiconductor nanocrystals, such as CdSe nanodots, CdS nanorods, have excellent optical and electrical properties due to their high photoluminescence and photoluminescence efficiency and adjustable emission wavelengths. There are important applications in such aspects. Currently these applications have been extended to laser diodes, lasers, displays, and biomarkers. Nano-rods and nanorods can be assembled to obtain nano-rod heterojunctions. Different types of material combinations can obtain different types of heterojunctions, and the luminescence properties of the nanorods can be further regulated by adjusting the ratio of nanorods and nano-dots. Regulation, which undoubtedly increases the regulatory dimensions of nanocrystallites and greatly enriches optoelectronic properties.