Optical and Scintillation Properties of Record-Efficiency CdTe Nanoplatelets toward Radiation Detection Applications

被引：21

作者：

Anand, Abhinav ^{[1
]}

Zaffalon, Matteo L. ^{[1
]}

Cova, Francesca ^{[1
]}

Pinchetti, Valerio ^{[1
]}

Khan, Ali Hossain ^{[2
]}

Carulli, Francesco ^{[1
]}

Brescia, Rosaria ^{[3
]}

Meinardi, Francesco ^{[1
]}

Moreels, Iwan ^{[2
,4
]}

Brovelli, Sergio ^{[1
,4
]}

机构：

[1] Univ Milano Bicocca, Dipartimento Sci Materiali, I-20125 Milan, Italy

[2] Univ Ghent, Dept Chem, B-9000 Ghent, Belgium

[3] Ist Italiano Tecnol, Electron Microscopy Facil, I-16163 Genoa, Italy

[4] Ist Italiano Tecnol, Electron Microscopy Facil, I-16163 Genoa, Italy

来源：

NANO LETTERS | 2022年 / 22卷 / 22期

基金：

欧盟地平线“2020”;

关键词：

CdTe nanoplatelets; GOST; exciton fine structure; scintillation; EXCITON FINE-STRUCTURE; SURFACE QUANTUM-WELLS; AUGER RECOMBINATION; ENERGY-TRANSFER; SEMICONDUCTOR; NANOCRYSTALS; EMISSION; DYNAMICS; CADMIUM; DOTS;

D O I：

10.1021/acs.nanolett.2c02975

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Colloidal CdTe nanoplatelets featuring a large absorption coefficient and ultrafast tunable luminescence coupled with heavy-metal-based composition present themselves as highly desirable candidates for radiation detection technologies. Historically, however, these nanoplatelets have suffered from poor emission efficiency, hindering progress in exploring their technological potential. Here, we report the synthesis of CdTe nanoplatelets possessing a record emission efficiency of 9%. This enables us to investigate their fundamental photophysics using ultrafast transient absorption, temperature-controlled photoluminescence, and radioluminescence measurements, elucidating the origins of exciton-and defect-related phenomena under both optical and ionizing excitation. For the first time in CdTe nanoplatelets, we report the cumulative effects of a giant oscillator strength transition and exciton fine structure. Simultaneously, thermally stimulated luminescence measurements reveal the presence of both shallow and deep trap states and allow us to disclose the trapping and detrapping dynamics and their influence on the scintillation properties.

引用

页码：8900 / 8907

页数：8

共 81 条

[1] Colloidal synthesis of CdTe nanoplatelets using various cadmium precursors [J].