Photophysics and Spin‐Physics Studies on Persistent Upconversion Luminescence from Nonlinearly Polarizable Ferroelectric‐Like Lattice Prepared by Orderly Packing Donor–Acceptor Structures under Multiphoton Excitation

2022 ◽  
pp. 2102002
Author(s):  
Yixuan Dou ◽  
Catherine Demangeat ◽  
Miaosheng Wang ◽  
Bogdan Dryzhakov ◽  
Kwang‐Sup Lee ◽  
...  
Keyword(s):  
Upconversion Luminescence ◽  
Multiphoton Excitation ◽  
Spin Physics ◽  
Donor Acceptor

scholarly journals VISUALIZATION OF Nd3+-DOPED LaF3 NANOPARTICLES FOR NEAR INFRARED BIOIMAGING VIA UPCONVERSION LUMINESCENCE AT MULTIPHOTON EXCITATION MICROSCOPY

2018 ◽  
Vol 7 (1) ◽  
pp. 4-12 ◽  
Author(s):  
A. V. Ryabova ◽  
K. Keevend ◽  
E. Tsolaki ◽  
S. Bertazzo ◽  
D. V. Pominova ◽  
...  
Keyword(s):  
Near Infrared ◽  
Upconversion Luminescence ◽  
Multiphoton Excitation

EL2-Induced Upconversion Luminescence In GaAs

1996 ◽  
Vol 442 ◽  
Author(s):  
V. Alex ◽  
T. Iino
Keyword(s):  
Band Gap ◽  
Upconversion Luminescence ◽  
Hot Electrons ◽  
Complete Disappearance ◽  
Acceptor Level ◽  
Acceptor Pair ◽  
Step Process ◽  
Regeneration Mechanism ◽  
Donor Acceptor ◽  
Donor Acceptor Pair

AbstractNear band gap luminescence in bulk-grown semi-insulating GaAs is excited in a two step process via the EL2 defect. While the conventionally excited photoluminescence of our samples is dominated by conduction band to acceptor transitions, the upconversion process selectively excites donor acceptor pair transitions. Illumination near the maximum of the EL2- photoquenching band at 1064 nm leads to a complete disappearance of the so called upconversion photoluminescence (UPL). Excitation with light of shorter wavelengths however only partially quenches the UPL. Excitation between 850nm and 900nm completely regenerates the UPL. The characteristic photorecovery transients of the UPL are described by the EL2 regeneration mechanism via the population of the acceptor level of the metastable EL2 by hot electrons. The recovery of the EL2 by simultaneous illumination with above and below band gap light enables the observation of UPL at wavelengths, where the EL2-defect would otherwise be rapidly quenched. Under these conditions we observe a remarkable increase of the UPL-efficiency.

scholarly journals Upconversion NIR-II fluorophores for mitochondria-targeted cancer imaging and photothermal therapy

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Hui Zhou ◽  
Xiaodong Zeng ◽  
Anguo Li ◽  
Wenyi Zhou ◽  
Lin Tang ◽  
...  
Keyword(s):  
Photothermal Therapy ◽  
Biomedical Applications ◽  
Cell Imaging ◽  
Upconversion Luminescence ◽  
Great Promise ◽  
Osteosarcoma Cells ◽  
Image Guided ◽  
Donor Acceptor ◽  
Subcellular Resolution

AbstractNIR-II fluorophores have shown great promise for biomedical applications with superior in vivo optical properties. To date, few small-molecule NIR-II fluorophores have been discovered with donor-acceptor-donor (D-A-D) or symmetrical structures, and upconversion-mitochondria-targeted NIR-II dyes have not been reported. Herein, we report development of D-A type thiopyrylium-based NIR-II fluorophores with frequency upconversion luminescence (FUCL) at ~580 nm upon excitation at ~850 nm. H4-PEG-PT can not only quickly and effectively image mitochondria in live or fixed osteosarcoma cells with subcellular resolution at 1 nM, but also efficiently convert optical energy into heat, achieving mitochondria-targeted photothermal cancer therapy without ROS effects. H4-PEG-PT has been further evaluated in vivo and exhibited strong tumor uptake, specific NIR-II signals with high spatial and temporal resolution, and remarkable NIR-II image-guided photothermal therapy. This report presents the first D-A type thiopyrylium NIR-II theranostics for synchronous upconversion-mitochondria-targeted cell imaging, in vivo NIR-II osteosarcoma imaging and excellent photothermal efficiency.

scholarly journals Upconversion luminescence of an insulator involving a band to band multiphoton excitation process

2011 ◽  
Vol 19 (12) ◽  
pp. 11753 ◽  
Author(s):  
Jiwei Wang ◽  
Jian Hua Hao ◽  
Peter A. Tanner
Keyword(s):  
Upconversion Luminescence ◽  
Multiphoton Excitation ◽  
Excitation Process

Analysis of time-resolved donor-acceptor-pair spectra of ZnSe : Li and ZnSe : N

1998 ◽  
Vol 184-185 (1-2) ◽  
pp. 531-535
Author(s):  
P Bäume
Keyword(s):  
Acceptor Pair ◽  
Time Resolved ◽  
Donor Acceptor ◽  
Donor Acceptor Pair

Approaches to empirical donor-acceptor and polarity-parameters of polymers in solution and at interfaces

1992 ◽  
Vol 89 ◽  
pp. 1615-1622 ◽  
Author(s):  
S Spange ◽  
D Keutel ◽  
F Simon
Keyword(s):  
Donor Acceptor ◽  
Polarity Parameters

Evidence of a donor-acceptor type transition in CuGaSe2

1980 ◽  
Vol 41 (7) ◽  
pp. 707-712 ◽  
Author(s):  
A. Poure ◽  
G. Aguero ◽  
G. Masse ◽  
J.P. Aicardi
Keyword(s):  
Type Transition ◽  
Donor Acceptor

SPIN PHYSICS AT LEAR

1985 ◽  
Vol 46 (C2) ◽  
pp. C2-421-C2-425
Author(s):  
F . Bradamante
Keyword(s):  
Spin Physics

Spin physics in semiconductor nanosystems

2012 ◽  
Vol 182 (8) ◽  
pp. 869 ◽  
Author(s):  
Eugeniyus L. Ivchenko
Keyword(s):  
Spin Physics
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