Highly efficient upconversion luminescence of Er heavily doped nanocrystals through 1530  nm excitation

Liu, Lu; Lu, Kailei; Li, Xu; Tang, Dongyang; Liu, Chao; Shahzad, Muhammud Khuram; Yan, Dong; Khan, Fahim; Zhao, Enming; Li, Hanyang

doi:10.1364/ol.44.000711

Cited by 21 publications

(12 citation statements)

References 24 publications

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“…4a, including two parts: two strong 2 H11/2/ 4 S3/2→ 4 I15/2 green emission transitions at ~531 nm and ~552 nm, respectively, and a weak 4 F9/2→ 4 I15/2 red emission transition at ~663nm. All emission bands correspond to the results reported for other ceramics [32,33] and nanocrystals [34] doped with Er 3+ . As shown in Fig.…”

Section: Published Bysupporting

confidence: 83%

“…For comparison, the sensitivity value of this material is greater than those of ZBLAN:Er 3+ glass [20], NaLuF4:Er 3+ /Yb 3+ microcrystals [21] and other Er 3+ -doped FE ceramics [33,[39][40][41], and is comparable to those of LiNbO3:Er 3+ /Yb 3+ particles [42] and BaTiO3:Er 3+ nanocrystals [43]. It was reported that higher thermal sensing was found in rare-earth doped nanoscale hosts [44] and also higher efficient UC luminescence was achieved through 1530 nm excitation [34]. EC and FL cooling of Er-doped nanoscale FE host is need to further study.…”

Section: Published Bymentioning

confidence: 92%

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Electro- and photon-induced cooling in BNT-BT-SBET relaxors with in situ optical temperature sensing

et al. 2020

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A novel lead-free luminescent ferroelectric (FE) ceramic, Bi0.5Na0.5TiO3-0.06BaTiO3-0.055Sr0.7Bi0.18Er0.02□0.1TiO3, is developed with an adiabatic temperature change (ΔT) of 0.7 K under an electric-field (E) of 60 kV/cm at room temperature (RT), an anti-stokes fluorescence (FL) cooling and a maximum optical T sensitivity of 0.0055 K -1 at 522 K. Interestingly, the electrocaloric (EC) response reaches a saturation at permittivity-shoulder T of 100 o C, meanwhile the maximized emission intensity of 2 H11/2→ 4 I15/2 occurs. T-and E-tunable enhancement of 2 H11/2→ 4 I15/2 emission intensity is due to the population inversion from the 4 S3/2 to 2 H11/2 states caused by an incoherent regime consisting of FE phase and polar nanoregions (PNRs) in a relaxor (R) matrix.

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Section: Published Bysupporting

confidence: 83%

Section: Published Bymentioning

confidence: 92%

Electro- and photon-induced cooling in BNT-BT-SBET relaxors with in situ optical temperature sensing

et al. 2020

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“…Importantly, the efficient NIR emission at around 800 nm validates the subcutaneous imaging and treatment as demonstrated later. As shown in our recent work [34], severe concentration quenching still occurs under 1530 nm excitation, indicating that the efficient energy harvest (due to 1530 nm pumping combined Er 3+ heavily doping) is mainly responsible for the highly improved upconversion emission. Upconversion mechanisms of Er 3+ excited by 1530 nm photon are investigated by power dependence measurements.…”

Section: Resultsmentioning

confidence: 52%

Efficient nanoheater operated in a biological window for photo-hyperthermia therapy

et al. 2019

Biomed. Opt. Express

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Remotely monitoring and regulating temperature in a small area are of vital importance for hyperthermia therapy. Herein, we report ~11 nm NaErF 4 nanocrystal as the ultra-small nanoheater, which is highly safe for biological applications. Under 1530 nm photon excitation, upconversion intensity of NaErF 4 is significantly enhanced as compared to the conventionally used 980 nm pumping source. Upconversion mechanisms are discussed on the basis of power dependence measurements. Importantly, light-to-heat transformation efficiency of NaErF 4 through 1530 nm pumping is determined as high as 75%. Efficient NIR emission, centered at ~800 nm and thus within the biological window, is used for the temperature feedback. The potential applications of this highly efficient nanoheater for controlled photo-hyperthermia treatments are also demonstrated.

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“…Er 3+ has a well spectral response around 1530 nm with a relative large absorption cross-section, but it is not suitable for sensitizer owing to the lacking of the matchable activator. Actually, a number of the literatures has announced Er 3+ doped UC materials pumping around 1530 nm realized via the excited state absorption process of Er 3+ ions themselves [32][33][34][35][36][37][38][39][40] . Disappointedly, their up-conversion quantum yields (UCQY) are extremely low, less than 0.5%, limited by the deleterious quenching interactions, and strong electron-phonon coupling etc.…”

Section: Main Textmentioning

confidence: 99%

NaYS2:Er3+ - a highly efficient NIR II response multi-photon up-conversion phosphor

Yin

Zhu

et al. 2021

Preprint

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The second near-infrared (NIR II) response photon up-conversion (UC) materials show great application prospects in the fields of biology and optical communication. However, it is still an enormous challenge to obtain efficient NIR II response materials. Herein, we developed a series of Er3+ doping ternary sulfides phosphors with highly efficient UC emissions under 1532 nm irradiation. Excitingly, β-NaYS2:Er3+ achieves a breakthrough visible UC efficiency as high as 6.13%, along with outstanding brightness, spectral stability of lights illumination and temperature. Such efficient UC dominates by excited state absorption process accompanied by the advantage of super long lifetimes of excited state levels of Er3+, instead of the well-recognized energy transfer UC between sensitizer and activator. NaYS2:Er3+ phosphors are further developed for high-performance underwater communication and a narrowband NIR photodetectors. Our findings breakthrough the traditional thinking of realizing efficient UC, and open up a novel frontier for developing NIR II response UC materials.

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Highly efficient upconversion luminescence of Er heavily doped nanocrystals through 1530 nm excitation

Cited by 21 publications

References 24 publications

Electro- and photon-induced cooling in BNT-BT-SBET relaxors with in situ optical temperature sensing

Electro- and photon-induced cooling in BNT-BT-SBET relaxors with in situ optical temperature sensing

Efficient nanoheater operated in a biological window for photo-hyperthermia therapy

NaYS2:Er3+ - a highly efficient NIR II response multi-photon up-conversion phosphor

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