Concentration dependent optical transition probabilities in ultra-small upconversion nanocrystals

Liu, Lu; Lu, Kailei; Yan, Dong; Zhao, Enming; Li, Hanyang; Shahzad, Muhammad Khuram; Zhang, Yang

doi:10.1364/oe.26.023471

Cited by 18 publications

(4 citation statements)

References 33 publications

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“…Also, the measured lifetimes are obviously smaller than expected. On the basis of the J-O calculation of 80 mol.% Er 3+ doped NaGdF4, which is similar to NaErF4, transition probabilities of Er 3+ fall within 10 1~1 0 3 s -1 ( 4 S3/2:240 s -1 , 4 F9/2:640 s -1 , and 4 I9/2:70 s -1 ) [20].…”

Section: Anomalous Variation Of Lifetime Versus Temperaturementioning

confidence: 85%

Temperature-Independent Lifetime and Thermometer Operated in a Biological Window of Upconverting NaErF4 Nanocrystals

et al. 2019

Nanomaterials

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Lifetime of lanthanide luminescence basically decreases with increasing the ambient temperature. In this work, we developed NaErF4 core–shell nanocrystals with compensation of the lifetime variation with temperature. Upconversion lifetime of various emissions remains substantially unchanged as increasing the ambient temperature, upon 980/1530 nm excitation. The concentrated dopants, leading to extremely strong interactions between them, are responsible for the unique temperature-independent lifetime. Besides, upconversion mechanisms of NaErF4 core-only and core–shell nanocrystals under 980 and 1530 nm excitations were comparatively investigated. On the basis of luminescent ratiometric method, we demonstrated the optical thermometry using non-thermally coupled 4F9/2 and 4I9/2 emissions upon 1530 nm excitation, favoring the temperature monitoring in vivo due to both excitation and emissions fall in the biological window. The formed NaErF4 core–shell nanocrystals with ultra-small particle size, highly efficient upconversion luminescence, unique temperature-independent lifetimes, and thermometry operated in a biological window, are versatile in applications such as anti-counterfeiting, time-domain manipulation, and biological thermal probes.

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Section: Anomalous Variation Of Lifetime Versus Temperaturementioning

confidence: 85%

Temperature-Independent Lifetime and Thermometer Operated in a Biological Window of Upconverting NaErF4 Nanocrystals

et al. 2019

Nanomaterials

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“…In addition, as evidence for Er 3+ strong cross-relaxation, the intensity ratios of red against green emission (I 652 /I 538 ) should gradually increase with the increase of Er 3+ cross-relaxation, [45] even I 652 >I 538 . [46] However, for Er 3+ X ∕Yb 3+ 0.9−X :CsPbCl 3 , intensity ratios of I 652 /I 538 changed slowly from maximum value of 0.51 at 0.2 m Er 3+ to minimum value of 0.46 at 0.8 m Er 3+ , indicating that no severe cross relaxation occurred. No UCL was observed in Er 3+ singly doped perovskite, suggesting the presence of Yb 3+ excitation is essential for UCL, which resulted from the energy transfer from Yb 3+ to Er 3+ .…”

Section: Resultsmentioning

confidence: 93%

Realization of 1.54‐µm Light‐Emitting Diodes Based on Er³⁺/Yb³⁺Co‐Doped CsPbCl₃ Films

Liu

Zhou

et al. 2023

Advanced Materials

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Erbium ions (Er 3+ , 1.54 μm) electric pumped light sources with excellent optical properties and a simple fabrication process are urgently desired to satisfy the development of silicon-based integration photonics. The previous Er-based electroluminescence devices are mainly based on Er-complexes or Er-doped oxide compounds, which usually suffer from low external quantum efficiency(EQE)or high applied voltage etc. In this work, a novel type of Er 3+ /Yb 3+ co-doped lead-halide perovskite films (Er 3+ /Yb 3+ :CsPbCl 3 ) with the maximum photoluminescence quantum yield of 30.12% are prepared by a simple two-step solution-coating method and the corresponding light emitting diodes (Er-PeLEDs) are fabricated, which demonstrate an almost pure 1.54-μm emission and a peak EQE up to 0.366% at a low applied voltage of 1.4 V. Strong negative thermal quenching effect may help Er-PeLEDs suppress Joule heating quenching. These excellent LED properties benefit mainly from the outstanding regulatory performance of acetate to perovskite films, the excellent semiconductor behavior and strong ionic property of the perovskite, and the involvement of Yb 3+ ions, which can directly and efficiently transfer the exciton energy to Er 3+ through a quantum cutting process. Overall, the realization of 1.54-μm Er-PeLEDs offers new opportunities for silicon-based integrated light sources.

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“…This can be mainly attributed to the combination of radiative and nonradiative decay behaviors. From one hand, the radiative transition rates of Er 3+ green (10 3 s −1 for 4 S 3/2 / 2 H 11/2 ) and red (10 2 s −1 for 4 F 9/2 ) emissions vary considerably [ 48 ], which partially contributes to the difference of green and red UCL decay-times. From another hand, nonradiative decay from upper state ( 4 F 7/2 ) to green states ( 4 S 3/2 / 2 H 11/2 ) is extremely fast, while the nonradiative decay that feeds the red state ( 4 S 3/2 → 4 F 9/2 ) is relatively slow, also leading to the prolonged decay-time of red UCL.…”

Section: Resultsmentioning

confidence: 99%

Mechanisms of Upconversion Luminescence of Er3+-Doped NaYF4 via 980 and 1530 nm Excitation

et al. 2021

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To date, the mechanisms of Er3+ upconversion luminescence via 980 and 1530 nm excitation have been extensively investigated; however, based on discussions, they either suffer from the lack of convincing evidence or require elaborated and time-consuming numerical simulations. In this work, the steady-state and time-resolved upconversion luminescence data of Er3+-doped NaYF4 were measured; we therefore investigated the upconversion mechanisms of Er3+ on the basis of the spectroscopic observations and the simplified rate equation modeling. This work provides a relatively simple strategy to reveal the UCL mechanisms of Er3+ upon excitation with various wavelengths, which may also be used in other lanthanide ion-doped systems.

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Concentration dependent optical transition probabilities in ultra-small upconversion nanocrystals

Cited by 18 publications

References 33 publications

Temperature-Independent Lifetime and Thermometer Operated in a Biological Window of Upconverting NaErF4 Nanocrystals

Temperature-Independent Lifetime and Thermometer Operated in a Biological Window of Upconverting NaErF4 Nanocrystals

Realization of 1.54‐µm Light‐Emitting Diodes Based on Er³⁺/Yb³⁺Co‐Doped CsPbCl₃ Films

Mechanisms of Upconversion Luminescence of Er3+-Doped NaYF4 via 980 and 1530 nm Excitation

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Concentration dependent optical transition probabilities in ultra-small upconversion nanocrystals

Cited by 18 publications

References 33 publications

Temperature-Independent Lifetime and Thermometer Operated in a Biological Window of Upconverting NaErF4 Nanocrystals

Temperature-Independent Lifetime and Thermometer Operated in a Biological Window of Upconverting NaErF4 Nanocrystals

Realization of 1.54‐µm Light‐Emitting Diodes Based on Er3+/Yb3+Co‐Doped CsPbCl3 Films

Mechanisms of Upconversion Luminescence of Er3+-Doped NaYF4 via 980 and 1530 nm Excitation

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Realization of 1.54‐µm Light‐Emitting Diodes Based on Er³⁺/Yb³⁺Co‐Doped CsPbCl₃ Films