文献类型：期刊文献

英文题名：Colloidal quantum-dot-based silica gel glass: two-photon absorption, emission, and quenching mechanism

作者：Li, Jingzhou[1,2];Dong, Hongxing[1];Zhang, Saifeng[1];Ma, Yunfei[3];Wang, Jun[1];Zhang, Long[1,4]

机构：[1]Chinese Acad Sci, Shanghai Inst Opt & Fine Mech, Key Lab Mat High Power Laser, Shanghai 201800, Peoples R China;[2]Univ Chinese Acad Sci, Beijing 100049, Peoples R China;[3]East China Univ Sci & Technol, Dept Chem, Lab Adv Mat, Shanghai 200237, Peoples R China;[4]Shanghai Jiao Tong Univ, IFSA Collaborat Innovat Ctr, Shanghai 200240, Peoples R China

年份：2016

卷号：8

期号：36

起止页码：16440

外文期刊名：NANOSCALE

收录：;EI(收录号：20163902841314);WOS:【SCI-EXPANDED(收录号:WOS:000384531600039)】；

基金：This work was supported financially by the NSFC (61378074, 61475173, and 61308034), the Shanghai Rising-star Program (A type 14QA1404000), the Youth Innovation Promotion Association of Chinese Academy of Sciences, and the Shanghai Science and Technology Committee (Grant No. 14PJ1401200).

语种：英文

外文关键词：Cadmium telluride - Nanocrystals - Sol-gel process - Optical properties - Silica - Pumping (laser) - Chemical industry - Digital storage - Glass - Photons - Quenching - Two photon processes - High temperature applications - II-VI semiconductors - Sintering

摘要：Two-photon (TP) three-dimensional solid matrices have potential applications in high density optical data reading and storage, infrared-pumped visible displays, lasers, etc. Such technologies will benefit greatly from the advantageous properties of TP materials including tunable emission wavelength, photostability, and simple chemical processing. Here, this ideal TP solid is made possible by using a facile sol-gel process to engineer colloid quantum dots into silica gel glass. Characterization using an open-aperture Z-scan technique shows that the solid matrices exhibited significant TP optical properties with a TP absorption coefficient of (9.41 +/- 0.39) x 10(-2) cm GW(-1) and a third-order nonlinear figure of merit of (7.30 +/- 0.30) x 10(-14) esu cm. In addition, the dependence of the TP properties on high-temperature thermal treatment is studied in detail to obtain a clear insight for practical applications. The results illustrate that the sample can maintain stable TP performance below the synthesis temperature of the CdTe/CdS colloidal quantum dots. Furthermore, the mechanisms for thermal quenching of photoluminescence under different temperature regimes are clarified as a function of the composition.