Emission and absorption cross sections of Er^3+:LiNbO_3 crystal: composition effect

Zhang, De‐Long; Sun, Wenbao; Wong, Wing‐Han; Pun, Edwin Yue-Bun

doi:10.1364/ome.5.001920

Cited by 8 publications

(3 citation statements)

References 16 publications

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“…The chemical synthesis of the nanocrystals has been extensively studied for a decade. 14−16 However, a small absorption crosssection of dopants, 17,18 concentration quenching, 19,20 and nonradiative emission channels at the surface of the nanocrystals 21 may impose some limitations to the upconversion luminescence (UCL) of the UCNCs. Recently, extensive attempts have been performed to improve the UCL efficiency either by changing the chemistry of the nanocrystals or by altering their nearby environment.…”

Section: ■ Introductionmentioning

confidence: 99%

“…For instance, the single lanthanide-doped (i.e., Er 3+ or Tm 3+ ) , UCNCs are more appropriate for the efficiency improvements in PV (specifically crystalline silicon (c-Si) solar cells) due to the conversion of near-infrared photons (λ > 1100 nm) into visible photons whereas the co-doped (i.e., Er 3+ –Yb 3+ ) UCNCs are appropriate for the biomedical applications , where the focus is on the conversion of 980 nm photons instead. The chemical synthesis of the nanocrystals has been extensively studied for a decade. − However, a small absorption cross-section of dopants, , concentration quenching, , and nonradiative emission channels at the surface of the nanocrystals may impose some limitations to the upconversion luminescence (UCL) of the UCNCs. Recently, extensive attempts have been performed to improve the UCL efficiency either by changing the chemistry of the nanocrystals or by altering their nearby environment.…”

Section: Introductionmentioning

confidence: 99%

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Resonant Plasmon-Enhanced Upconversion in Monolayers of Core–Shell Nanocrystals: Role of Shell Thickness

Lakhotiya

Nazir

Roesgaard

et al. 2018

ACS Appl. Mater. Interfaces

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The upconversion luminescence (UCL) of colloidal lanthanide-doped upconversion nanocrystals (UCNCs) can be improved either by precise encapsulation of the surface by optically inert shells around the core, by an alteration of the nearby environment via metal nanoparticles, or by a combination of both. Considering their potential importance in crystalline silicon photovoltaics, the present study investigates both effects for two-dimensional arrangements of UCNCs. Using excitation light of 1500 nm wavelength, we study the variation in the upconversion luminescence from an Er 3+ -doped NaYF 4 core as a function of the thickness of a NaLuF 4 shell in colloidal solutions as well as in spin-cast-assisted self-assembled monolayers of UCNCs. The observed UCL yields and decay times of Er 3+ ions of the UCNCs increase with increasing shell thickness in both cases, and nearly no variation in decay times is observed in the transition of the UCNCs from solution to film configurations. The luminescence efficiency of the UCNC monolayers is further enhanced by electron-beam-lithographic-designed Au nanodiscs deposited either on top of or buried within the monolayer. It is observed that the improvement by the nanocrystal shells is greater than that of the Au nanodiscs.

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Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Resonant Plasmon-Enhanced Upconversion in Monolayers of Core–Shell Nanocrystals: Role of Shell Thickness

Lakhotiya

Nazir

Roesgaard

et al. 2018

ACS Appl. Mater. Interfaces

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“…The polarized emission spectra of Yb, Er:CLN was analyzed clearly before. , In general, the polarized emission spectra of this Yb, Er:NSLN crystal is very similar with that of Yb, Er:CLN crystal. However, there are still some significant stoichiometry induced spectral changes.…”

Section: Results and Discussionmentioning

confidence: 79%

Yb Sensitized Near-Stoichiometric Er:LiNbO₃ Single Crystal: A Matrix for Optical Communication and Upconversion Emission

Wang

Kang

Liang

et al. 2018

Crystal Growth & Design

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Ytterbium and erbium codoped crystals have attracted considerable interest in the application of eye-safe laser, upconversion laser, and low-loss optical communication. Despite the lithium niobate (LiNbO3, LN) single crystal has been accepted as an ideal crystal matrix for Yb3+ and Er3+ ions possessing significant application potential in self-upconversion laser, the Yb and Er codoped near-stoichiometric LN (NSLN) crystal has rarely been studied. This is due to the difficulty of the NSLN crystal growth compared with that of the congruent LN (CLN). In this paper, an Yb, Er codoped near-stoichiometric LN (Yb, Er:NSLN) crystal was grown by the Czochrolski method for the first time. Spectra studies showed the constrained peak splitting at 378, 526, and 650 nm of the Yb, Er:NSLN crystal compared with Yb, Er:CLN crystal. It was attributed to the low concentration of intrinsic defects which constrained the Stark-split of the three energy levels of 4G11/2, 2H11/2, and 4F9/2 energy states. Some spectral changes are verified induced by the stoichiometric composition in the polarized emission spectra. The Yb, Er:NSLN crystal has high potential in upconversion laser application.

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Photothermal effects in the optical material

Dwivedi¹,

Catunda²,

Shyam³

2023

Photoacoustic and Photothermal Spectroscopy

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Emission and absorption cross sections of Er^3+:LiNbO_3 crystal: composition effect

Cited by 8 publications

References 16 publications

Resonant Plasmon-Enhanced Upconversion in Monolayers of Core–Shell Nanocrystals: Role of Shell Thickness

Resonant Plasmon-Enhanced Upconversion in Monolayers of Core–Shell Nanocrystals: Role of Shell Thickness

Yb Sensitized Near-Stoichiometric Er:LiNbO₃ Single Crystal: A Matrix for Optical Communication and Upconversion Emission

Photothermal effects in the optical material

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Emission and absorption cross sections of Er^3+:LiNbO_3 crystal: composition effect

Cited by 8 publications

References 16 publications

Resonant Plasmon-Enhanced Upconversion in Monolayers of Core–Shell Nanocrystals: Role of Shell Thickness

Resonant Plasmon-Enhanced Upconversion in Monolayers of Core–Shell Nanocrystals: Role of Shell Thickness

Yb Sensitized Near-Stoichiometric Er:LiNbO3 Single Crystal: A Matrix for Optical Communication and Upconversion Emission

Photothermal effects in the optical material

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Product

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Yb Sensitized Near-Stoichiometric Er:LiNbO₃ Single Crystal: A Matrix for Optical Communication and Upconversion Emission