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optical properties of core/shell spherical quantum dots

Chinese Physics B 2020年第9期29卷 536-542页

作者： Shuo Li Lei Shi Zu-Wei Yan College of Science Inner Mongolia Agricultural UniversityHohhot 010018China

In this study,the effects of quantum dot size on the binding energy,radiative lifetime,and optical absorption coefficient of exciton state in both GaN/AlxGa1-xN core/shell and AlxGa1-xN/GaN inverted core/shell quantum dot structures are *** the GaN/AlxGa1-xN core/shell structure,the variation trend of binding energy is the same as that of radiation lifetime,both of which increase first and then decrease with the increase of core *** AlxGa1-xN/GaN inverted core/shell structure,the binding energy decreases first and then increases with core size increasing,and the trends of radiation lifetime varying with core size under different shell sizes are *** both structures,when the photon energy is approximately equal to the binding energy,the peak value of the absorption coefficient appears,and there will be different peak shifts under different conditions.

关键词： spherical quantum dot binding energy optical absorption coefficient exciton radiation lifetime

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Measurement and feature analysis of absorption spectra of four algal species

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Chinese Journal of Oceanology and Limnology 2017年第2期35卷 350-359页

作者：朱建华周虹丽韩冰李铜基 National Ocean Technology Center Tianjin 300111 China

Two methods for particulate pigments(i.e.,quantitative filter technique,QFT,and in vivo measurement,InVivo,respectively)and two methods for dissolved pigments(i.e.,Acetone Extracts,AceEx,and high-performance liquid chromatography,HPLC,respectively) were used to obtain the optical absorption coefficient spectra for cultures of four typical algal *** normalization and analysis of the spectra,it is shown that(1) the four methods are able to measure optical absorption spectra of particulate and/or dissolved pigments;(2)that the optical absorption spectra of particulate and dissolved pigments were consistent in terms of the peak position in the blue wavelength,and the difference of the peak position in the near infrared wavelength was ~10nm between each other;and(3)that the leveling effect of the absorption spectra of particulate pigments was *** four methods can all effectively measure the absorption coefficients of phytoplankton pigments,while each one has its unique advantages in different ***,appropriate method should be carefully selected for various application due to their intrinsic difference.

关键词： algal species optical absorption coefficient spectral pattern normalization

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