Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 8, Issue 21, Pages 5317-5324Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.7b02367
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Funding
- National Research Foundation, Prime Minister's Office, Singapore under NRF Investigatorship Award [NRF-NRFI2016-08]
- A*STAR SERC PHAROS Program of Singapore [152 73 00025]
- EU-FP7 Nanophotonics4Energy NoE
- TUBITAK [114F326, 114E449]
- ESF-EURYI
- TUBA
- TUBITAK-BIDEB
- U.S. National Science Foundation [CHE-1309817]
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Colloidal nanocrystals having controlled size, tailored shape, and tuned composition have been explored for optical gain and lasing. Among these, nanocrystals having Type-II electronic structure have been introduced toward low-threshold gain. However, to date, their performance has remained severely limited due to diminishing oscillator strength and modest absorption cross-section. Overcoming these problems, here we realize highly efficient optical gain in Type-II nanocrystals by using alloyed colloidal quantum wells. With composition-tuned core/alloyed-crown CdSe/CdSexTe1-x quantum wells, we achieved amplified spontaneous emission thresholds as low as 26 mu J/cm(2), long optical gain lifetimes (tau(gain) approximate to 400 ps), and high modal gain coefficients (g(modal) approximate to 930 cm(-1)). We uncover that the optical gain in these Type-II quantum wells arises from the excitations localized to the alloyed-crown region that are electronically coupled to the charge-transfer state. These alloyed heteronanostructures exhibiting remarkable optical gain performance are expected to be highly appealing for future display and lighting technologies.
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