量子点
发光
光热治疗
量子产额
光电子学
硒化镉
产量(工程)
材料科学
量子效率
量化(信号处理)
量子
硫化镉
纳米技术
化学
物理
光学
量子力学
数学
荧光
统计
冶金
作者
David Hanifi,Noah D. Bronstein,Brent A. Koscher,Zach Nett,Joseph K. Swabeck,Kaori Takano,Adam M. Schwartzberg,Lorenzo Maserati,Koen Vandewal,Yoeri van de Burgt,Alberto Salleo,A. Paul Alivisatos
出处
期刊:Science
[American Association for the Advancement of Science (AAAS)]
日期:2019-03-15
卷期号:363 (6432): 1199-1202
被引量:187
标识
DOI:10.1126/science.aat3803
摘要
A variety of optical applications rely on the absorption and reemission of light. The quantum yield of this process often plays an essential role. When the quantum yield deviates from unity by significantly less than 1%, applications such as luminescent concentrators and optical refrigerators become possible. To evaluate such high performance, we develop a measurement technique for luminescence efficiency with sufficient accuracy below one part per thousand. Photothermal threshold quantum yield is based on the quantization of light to minimize overall measurement uncertainty. This technique is used to guide a procedure capable of making ensembles of near-unity emitting cadmium selenide/cadmium sulfide (CdSe/CdS) core-shell quantum dots. We obtain a photothermal threshold quantum yield luminescence efficiency of 99.6 ± 0.2%, indicating nearly complete suppression of nonradiative decay channels.
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