Efficient free exciton emission at room temperature in Zn 0.5Cd0.5Se/MgxZnyCd 1-x-ySe quantum wells

O. Maksimov; N. Samarth; H. Lu; Martin Muñoz; M. C. Tamargo

doi:10.1016/j.ssc.2004.07.022

Efficient free exciton emission at room temperature in Zn _0.5Cd_0.5Se/Mg_xZn_yCd _1-x-ySe quantum wells

O. Maksimov, N. Samarth, H. Lu, Martin Muñoz, M. C. Tamargo

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

We use temperature and power-dependent photoluminescence spectroscopy to demonstrate efficient free exciton emission at room temperature in high quality, strongly confining Zn_0.5Cd_0.5Se/Mg_xZn _yCd_1-x-ySe quantum wells. Our measurements indicate that at low temperatures (T<50 K), the luminescence is dominated by bound exciton emission. However, free exciton emission becomes dominant at high temperatures (T> 100 K) and persists up to room temperature with an intensity that is ∼40% that at cryogenic temperatures. We attribute these observations to the deep confinement potential that stabilizes excitons and prevents their thermal escape.

Original language	English (US)
Pages (from-to)	1-5
Number of pages	5
Journal	Solid State Communications
Volume	132
Issue number	1
DOIs	https://doi.org/10.1016/j.ssc.2004.07.022
State	Published - Oct 2004

All Science Journal Classification (ASJC) codes

General Chemistry
Condensed Matter Physics
Materials Chemistry

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10.1016/j.ssc.2004.07.022

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title = "Efficient free exciton emission at room temperature in Zn 0.5Cd0.5Se/MgxZnyCd 1-x-ySe quantum wells",

abstract = "We use temperature and power-dependent photoluminescence spectroscopy to demonstrate efficient free exciton emission at room temperature in high quality, strongly confining Zn0.5Cd0.5Se/MgxZn yCd1-x-ySe quantum wells. Our measurements indicate that at low temperatures (T<50 K), the luminescence is dominated by bound exciton emission. However, free exciton emission becomes dominant at high temperatures (T> 100 K) and persists up to room temperature with an intensity that is ∼40% that at cryogenic temperatures. We attribute these observations to the deep confinement potential that stabilizes excitons and prevents their thermal escape.",

author = "O. Maksimov and N. Samarth and H. Lu and Martin Mu{\~n}oz and Tamargo, {M. C.}",

note = "Funding Information: M.M., H.L., and M.C.T. were supported by NSF through grant ECS0217646. O.M. and N.S. acknowledge the support of the DARPA-QUIST program through the Center for Spintronics and Quantum Computation, University of California-Santa Barbara.",

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T1 - Efficient free exciton emission at room temperature in Zn 0.5Cd0.5Se/MgxZnyCd 1-x-ySe quantum wells

AU - Maksimov, O.

AU - Samarth, N.

AU - Lu, H.

AU - Muñoz, Martin

AU - Tamargo, M. C.

N1 - Funding Information: M.M., H.L., and M.C.T. were supported by NSF through grant ECS0217646. O.M. and N.S. acknowledge the support of the DARPA-QUIST program through the Center for Spintronics and Quantum Computation, University of California-Santa Barbara.

PY - 2004/10

Y1 - 2004/10

N2 - We use temperature and power-dependent photoluminescence spectroscopy to demonstrate efficient free exciton emission at room temperature in high quality, strongly confining Zn0.5Cd0.5Se/MgxZn yCd1-x-ySe quantum wells. Our measurements indicate that at low temperatures (T<50 K), the luminescence is dominated by bound exciton emission. However, free exciton emission becomes dominant at high temperatures (T> 100 K) and persists up to room temperature with an intensity that is ∼40% that at cryogenic temperatures. We attribute these observations to the deep confinement potential that stabilizes excitons and prevents their thermal escape.

AB - We use temperature and power-dependent photoluminescence spectroscopy to demonstrate efficient free exciton emission at room temperature in high quality, strongly confining Zn0.5Cd0.5Se/MgxZn yCd1-x-ySe quantum wells. Our measurements indicate that at low temperatures (T<50 K), the luminescence is dominated by bound exciton emission. However, free exciton emission becomes dominant at high temperatures (T> 100 K) and persists up to room temperature with an intensity that is ∼40% that at cryogenic temperatures. We attribute these observations to the deep confinement potential that stabilizes excitons and prevents their thermal escape.

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U2 - 10.1016/j.ssc.2004.07.022

DO - 10.1016/j.ssc.2004.07.022

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SN - 0038-1098

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JO - Solid State Communications

JF - Solid State Communications

IS - 1

ER -

Efficient free exciton emission at room temperature in Zn _0.5Cd_0.5Se/Mg_xZn_yCd _1-x-ySe quantum wells

Abstract

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