Laser cooling with PbSe colloidal quantum dots

Nemova, Galina; Kashyap, Raman

doi:10.1364/josab.29.000676

Cited by 17 publications

(14 citation statements)

References 29 publications

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“…Third, alternative pumping schemes and emission methods may increase the possible cooling load. For example, pump–pulse schemes can cause collective emission from ions with shorter lifetimes, known as superradiance, reducing the requirement for low‐phonon hosts and opening the door to nanocrystal‐based laser cooling . Fourth, hydrothermal synthesis can make large amounts of high purity and quality nanocrystals for laser cooling application, allowing rapid combinatorial evaluation of materials.…”

Section: Discussionmentioning

confidence: 99%

Photothermal Heating and Cooling of Nanostructures

Crane

Zhou

Davis

et al. 2018

Chemistry An Asian Journal

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A vast range of insulating, semiconducting, and metallic nanomaterials have been studied over the past several decades with the aim of understanding how continuous-wave or pulsed laser radiation can influence their chemical functionality and local environment. Many fascinating observations have been made during laser irradiation including, but not limited to, the superheating of solvents, mass-transport-mediated morphology evolution, photodynamic therapy, morphology dependent resonances, and a range of phase transformations. In addition to laser heating, recent experiments have demonstrated the laser cooling of nanoscale materials through the emission of upconverted, anti-Stokes photons by trivalent rare-earth ions. This Focus Review outlines the analytical modeling of photothermal heat transport with an emphasis on the experimental validation of anti-Stokes laser cooling. This general methodology can be applied to a wide range of photothermal applications, including nanomedicine, photocatalysis, and the synthesis of new materials. The review concludes with an overview of recent advances and future directions for anti-Stokes cooling.

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Section: Discussionmentioning

confidence: 99%

Photothermal Heating and Cooling of Nanostructures

Crane

Zhou

Davis

et al. 2018

Chemistry An Asian Journal

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“…To overcome this problem we have proposed the system of artificial, engineered materials such as QD-doped glasses. 6 Remembering that as soon as bulk semiconductor reduces in size and the size of the crystal becomes comparable to, or smaller than the Bohr radius, quantum confinement becomes important and the conduction and valence bands becomes quantized (Fig.2). This small semiconductor named QD can operate like an artificial atom.…”

Section: Laser Cooling With Lead Salt Qd -Doped Glass Hostmentioning

confidence: 99%

Recent advances in laser cooling of solids

Nemova

Kashyap

2013

Photonics North 2013

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The recent achievements devoted to cooling of solids with a laser are presented in this paper. We discuss the latest results of traditional laser cooling of solids based on rare earth ions and new techniques based on colloidal lead-salt quantum dots doped in a glass host, laser cooling in Tm 3+ -doped oxy-fluoride glass ceramic. Relatively short (microsecond) lifetime of the excited level of the PbSe QDs compared to the millisecond lifetime of the excited level of RE ions allows an acceleration of the cooling process and provides an opportunity to use new materials with higher phonon energy as hosts, which are normally considered unsuitable for cooling with RE ions. Another new approach to the laser cooling problem based on super-radiance has been considered in this paper. The advantages of optical refrigeration with rare earth doped semiconductors, in which not only optically active electrons of the 4f shell but the valence and conduction bands of the host material are involved in cooling cycle is discussed. It is shown that involving the valence and conduction bands of the host in the cooling cycle allows the pump wavelength to be shorter than mean fluorescence wavelength. Raman laser cooling of solids as well as observation of spontaneous Brillouin cooling have been presented.

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“…Anti‐Stokes photoluminescence (ASPL) is luminescence where the energy of emission photons higher than that of the excitation photons. In general, Auger recombination, two‐photon absorption processes, and phonon‐assisted one‐photon processes are considered to be the main mechanisms of ASPL generation. The Auger recombination process refers to the transfer of recombined energy to another electron or hole in a semiconductor when an electron‐hole pair recombines, so that the electron or hole transitions to a higher energy level, thus the excited electrons or holes recombination produces higher energy photons, producing ASPL.…”

Section: Introductionmentioning

confidence: 99%

“…The phonon‐assisted one‐photon processes is that electrons absorb a photon transition and then interact with phonons to absorb their energy transition of one or more phonons to a higher energy level, and then radiate recombination to produce ASPL. Many scholars believed that anti‐Stokes PL in QDs materials, such as CdSe, PbS, and PbSe are phonon‐assisted one‐photon processes. According to the different processes of ASPL producing, the ASPL intensity exhibits different relationship with excitation intensity.…”

Section: Introductionmentioning

confidence: 99%

Photodarkening and anti‐Stokes photoluminescence from PbSe and Sr²⁺‐doped PbSe quantum dots in silicate glasses

et al. 2018

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Photoluminescence (PL) properties of PbSe and Sr2+‐doped PbSe quantum dots (QDs) doped in silicate glasses were investigated by changing the excited laser wavelength and intensity. When BaO was replaced by SrO, the Sr2+‐doped PbSe QDs formed and showed large blue‐shifts in both absorption and PL bands compared to the PbSe QDs. It is attributed to the increasing in band gap resulted by the incorporation of Sr2+ ions into PbSe QDs. These two kinds of QDs were excited by the laser with the wavelengths of 1319 and 1532 nm. When rising the pumping intensity up to 1000 mW, the PL intensity from Sr2+‐doped PbSe QDs monotonically increased, while, the PL intensity from PbSe QDs reached maximum at pumping intensity at ~200 mW (λex = 1319 nm) and ~300 mW (λex = 1532 nm). The good resistance to photodarkening of Sr2+‐doped PbSe QDs is indicated passivation effect on the surface defects from Sr2+ ions doping. For Sr2+‐doped PbSe QDs the anti‐Stokes photoluminescence (ASPL) were observed when using both 1319 and 1532 nm excitation. The integrated intensity of the ASPL is linear with the excitation intensity, which indicates that the ASPL belongs to the phonon‐assisted one‐photon process. And the ASPL intensity as a function of excitation intensity shows a size dependence of the QDs.

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Laser cooling with PbSe colloidal quantum dots

Cited by 17 publications

References 29 publications

Photothermal Heating and Cooling of Nanostructures

Photothermal Heating and Cooling of Nanostructures

Recent advances in laser cooling of solids

Photodarkening and anti‐Stokes photoluminescence from PbSe and Sr²⁺‐doped PbSe quantum dots in silicate glasses

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Laser cooling with PbSe colloidal quantum dots

Cited by 17 publications

References 29 publications

Photothermal Heating and Cooling of Nanostructures

Photothermal Heating and Cooling of Nanostructures

Recent advances in laser cooling of solids

Photodarkening and anti‐Stokes photoluminescence from PbSe and Sr2+‐doped PbSe quantum dots in silicate glasses

Contact Info

Product

Resources

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Photodarkening and anti‐Stokes photoluminescence from PbSe and Sr²⁺‐doped PbSe quantum dots in silicate glasses