Defect-mediated photoluminescence up-conversion in cadmium sulfide nanobelts (Conference Presentation)

Yurii Morozov; Masaru K. Kuno

doi:10.1117/12.2249930

20 April 2017 Defect-mediated photoluminescence up-conversion in cadmium sulfide nanobelts (Conference Presentation)

Yurii Morozov, Masaru K. Kuno

Proceedings Volume 10121, Optical and Electronic Cooling of Solids II; 101210D (2017) https://doi.org/10.1117/12.2249930
Event: SPIE OPTO, 2017, San Francisco, California, United States

Abstract

The concept of optical cooling of solids has existed for nearly 90 years ever since Pringsheim proposed a way to cool solids through the annihilation of phonons via phonon-assisted photoluminescence (PL) up-conversion. In this process, energy is removed from the solid by the emission of photons with energies larger than those of incident photons. However, actually realizing optical cooling requires exacting parameters from the condensed phase medium such as near unity external quantum efficiencies as well as existence of a low background absorption. Until recently, laser cooling has only been successfully realized in rare earth doped solids. In semiconductors, optical cooling has very recently been demonstrated in cadmium sulfide (CdS) nanobelts as well as in hybrid lead halide perovskites. For the former, large internal quantum efficiencies, sub-wavelength thicknesses, which decrease light trapping, and low background absorption, all make near unity external quantum yields possible. Net cooling by as much as 40 K has therefore been possible with CdS nanobelts. In this study, we describe a detailed investigation of the nature of efficient anti-Stokes photoluminescence (ASPL) in CdS nanobelts. Temperature-dependent PL up-conversion and optical absorption studies on individual NBs together with frequency-dependent up-converted PL intensity spectroscopies suggest that ASPL in CdS nanobelts is defect-mediated through involvement of defect levels below the band gap.

Conference Presentation

Citation Download Citation

Yurii Morozov and Masaru K. Kuno "Defect-mediated photoluminescence up-conversion in cadmium sulfide nanobelts (Conference Presentation)", Proc. SPIE 10121, Optical and Electronic Cooling of Solids II, 101210D (20 April 2017); https://doi.org/10.1117/12.2249930

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
PRESENTATION

WATCH
PRESENTATION SAVE TO MY LIBRARY

GET CITATION

KEYWORDS

Cadmium sulfide

Solids

Luminescence

Absorption

Optical cooling

Photons

External quantum efficiency

Show All Keywords

Keywords/Phrases

Search In:

Publication Years