Recent advances in optical properties and applications of colloidal quantum dots under two-photon excitation

Gui, Rijun; Jin, Hui; Wang, Zonghua; Tan, Lianjiang

doi:10.1016/j.ccr.2017.02.007

Cited by 58 publications

(32 citation statements)

References 262 publications

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“…23 The two-photon excitation action cross-section (r 2 ÁQY) of per individual CsPbCl 3 :Mn NC, the parameter relevant for nonlinear bioimaging, was equal to 95 400 GM at 720 nm. This value is 1-2 orders of magnitude higher than the values of two-photon brightness for -NH 2 modified graphene oxide conjugates ($16412 GM), 24 colloidal InP/ZnS core-shell NCs ($2418 GM), 25 stilbene chromophore ($380 GM), 26 and diketopyrrolopyrrole derivatives ($1011 GM). 27 From the previous report, it is known that TPA crosssections correlate strongly with NC size and follow a powerlaw dependence on NC size with exponent $3.…”

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confidence: 74%

Strong two-photon absorption of Mn-doped CsPbCl3 perovskite nanocrystals

Ren

et al. 2017

Applied Physics Letters

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Emerging CsPbX 3 (X ¼ Cl, Br, and I) perovskite nanocrystals (NCs) have been demonstrated to be efficient emitters with a high fluorescence quantum yield, making these materials interesting for optical applications as well as for fundamental physics. Interestingly, doping with transition metal ions has been extensively explored as a way of introducing new optical, electronic, and magnetic properties, making perovskite NCs much more functional than their undoped counterparts. However, there have been no reports regarding the nonlinear optical properties of transition metal ion doped perovskite NCs. Herein, by using femtosecond-transient absorption spectroscopy, we have determined the one-photon linear absorption cross-section ($1.42 Â 10 À14 cm 2) of Mn-doped CsPbCl 3 NCs ($11.7 6 1.8 nm size, $0.2% doping concentration, and $600 nm emission wavelength). More importantly, their nonlinear optical properties-in particular, the two-photon absorption (TPA) and resultant emission-were investigated. Notably, the NCs exhibit wavelength-dependent TPA with a maximum value up to $3.18 Â 10 5 GM at a wavelength of 720 nm. Our results indicate that Mn-doped CsPbCl 3 NCs show promise in nonlinear optical devices and multiphoton fluorescence lifetime imaging.

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confidence: 74%

Strong two-photon absorption of Mn-doped CsPbCl3 perovskite nanocrystals

Ren

et al. 2017

Applied Physics Letters

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“…In addition, their appreciable room-temperature phosphorescence was found, even in those carbon dots which were made of only light atoms and could basically display only weak spin-orbit coupling [266][267][268]. These nanoparticles demonstrate very high two-photon absorption (TPA) cross-sections (on the level of 40,000 GM) combined with high luminescence quantum yields [24,269], whereas similar properties of molecular fluorophores can be achieved only with a very special design and still at a low levels of emission intensities. This unique behavior of nanocarbon particles is not always observed and reported, but there are many relevant documented cases in support.…”

Section: The Novel Excitonic Conceptmentioning

confidence: 99%

“…Similar or even higher σ values were reported later [24,306] and the high two-photon absorption efficiency of G-dots and GO-dots was also demonstrated. These values have made the carbonic nanoparticles competitive to the best-performing semiconductor QDs [269]. They showed to be considerably better than the best performing molecular organic dyes [307].…”

Section: Strong Two-photon Absorbancementioning

confidence: 99%

Excitons in Carbonic Nanostructures

Demchenko

2019

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Unexpectedly bright photoluminescence emission can be observed in materials incorporating inorganic carbon when their size is reduced from macro–micro to nano. At present, there is no consensus in its understanding, and many suggested explanations are not consistent with the broad range of experimental data. In this Review, I discuss the possible role of collective excitations (excitons) generated by resonance electronic interactions among the chromophore elements within these nanoparticles. The Förster-type resonance energy transfer (FRET) mechanism of energy migration within nanoparticles operates when the composing fluorophores are the localized electronic systems interacting at a distance. Meanwhile, the resonance interactions among closely located fluorophores may lead to delocalization of the excited states over many molecules resulting in Frenkel excitons. The H-aggregate-type quantum coherence originating from strong coupling among the transition dipoles of adjacent chromophores in a co-facial stacking arrangement and exciton transport to emissive traps are the basis of the presented model. It can explain most of the hitherto known experimental observations and must stimulate the progress towards their versatile applications.

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“…QDs have many useful optical and chemical properties such as symmetric emission distributions, and high quantum yields, brightness, and light stability (Das, Bandyopadhyay, & Pramanik, 2018;Khan, Khan, & Zulfequar, 2017;Li, Qian, & Ren, 2005). QDs have been widely used in molecular biology (Tan et al, 2018), cell biology (Zhao et al, 2018), immunobiology (Li & Ding, 2016;Liao et al, 2019), and various detection applications (Gao, Zhao, Chen, & Fan, 2018;Gui, Jin, Wang, & Tan, 2017;Jiang, Wu, Xu, Qiao, & Xu, 2017;Kumar, Joanni, Singh, Singh, & Moshkalev, 2018;Yi & Shen, 2015). QDs are smaller than traditional enzyme and are therefore more suitable markers than enzymes in BIAs.…”

Section: Introductionmentioning

confidence: 99%