Results 81 to 90 of about 7,192 (202)

High resolution fluorescence imaging of cancers using lanthanide ion-doped upconverting nanocrystals [PDF]

, 2012
During the last decade inorganic luminescent nanoparticles that emit visible light under near infrared (NIR) excitation (in the biological window) have played a relevant role for high resolution imaging of cancer. Indeed, semiconductor quantum dots (QDs)
Bogdan, Nicoleta, Capobianco, John A., García Solé, José, Iglesias de la Cruz, María del Carmen, Jaque, Daniel, Juarranz, Ángeles, Martín Rodríguez, Emma, Naccache, Rafik, Sanz-Rodríguez, Francisco, Vetrone, Fiorenzo   +9 more
core   +3 more sources

Programmable luminescent platform based on carbon quantum dots enables wavelength‐multiplexed optical data storage and encryption

FlexMat, EarlyView.
A carbon‐quantum‐dots (CQDs)‐based programmable luminescent platform is proposed for multidimensional optical information encryption and high‐capacity data storage by leveraging wavelength‐division multiplexing. Furthermore, a prototype tri‐layer optical disk is demonstrated, where data written via laser ablation on different CQD layers are retrieved ...
Honglei Sun, Qingfeng Gui, Yunsong Di, Zihan Ying, Siqi Liu, Mengqi Li, Meng Zhang, Lun Yang, Yushen Liu, Zhixing Gan   +9 more
wiley   +1 more source

Spirobifluorene fusion in multiple resonance frameworks enables efficient pure‐red OLEDs with narrowband emission and suppressed efficiency roll‐off

FlexMat, EarlyView.
An orthogonal spirobifluorene‐fusion strategy is introduced for B/N/O‐alternated MR frameworks, enabling improved kRISC (5.46 × 103 s−1), high ΦPL (97%), and narrow‐band pure‐red emission. Vacuum‐evaporated OLEDs incorporating this emitter achieve an EQEmax >40% (FWHM = 36 nm) and exhibit exceptionally low efficiency roll‐off at high luminance ...
Yan‐Yun Jing, Han Wu, Xiaoling Xu, Sijie Xian, Jingsheng Miao, Xiaojun Yin, Chuluo Yang, Xiaosong Cao   +7 more
wiley   +1 more source

Heteroatom location‐ and orientation mode‐dependent reverse intersystem crossing rate in multiple resonance emitters

FlexMat, EarlyView.
By constructing two pairs of isomers with different heteroatom anchoring positions, the relationship between heteroatom location and orientation mode and reverse intersystem crossing rate constant (kRISC) in multiple resonance (MR) emitters is systematically investigated.
Tingting Huang, Yincai Xu, Yupei Qu, Xinliang Cai, Jinbei Wei, Yue Wang   +5 more
wiley   +1 more source

Exceeding the solar cell Shockley-Queisser limit via thermal up-conversion of low-energy photons [PDF]

, 2013
Maximum efficiency of ideal single-junction photovoltaic (PV) cells is limited to 33% (for one sun illumination) by intrinsic losses such as band edge thermalization, radiative recombination, and inability to absorb below-bandgap photons.
Boriskina, Svetlana V., Chen, Gang
core   +2 more sources

Recent Advances in Photonic Bound States in the Continuum: From Fundamentals to Engineering and Implementation

Laser &Photonics Reviews, EarlyView.
This review summarizes recent progress in meta‐photonics with a focus on bound states in the continuum (BICs) as a powerful platform for light confinement and control. It covers fundamental concepts, design strategies across optical regimes, symmetry breaking for practical quasi‐BICs, tunable and AI‐assisted BIC devices, and emerging applications in ...
Hafiz Saad Khaliq, Hak‐Rin Kim
wiley   +1 more source

The Impact of the Amorphous-to-Crystalline Transition on the Upconversion Luminescence in Er³⁺-Doped Ga₂O₃ Thin Films

Energies
Gallium oxide (Ga2O3) is an emerging wide bandgap semiconductor promising a wide range of important applications. However, mass production of high-quality crystalline Ga2O3 still suffers from limitations associated with poor reproducibility and low ...
Yuanlin Liang, Haisheng Chen, Dianmeng Dong, Jiaxing Guo, Xiaona Du, Taiyu Bian, Fan Zhang, Zhenping Wu, Yang Zhang   +8 more
doaj   +1 more source

Cooling of radiative quantum-dot excitons by terahertz radiation: A spin-resolved Monte Carlo carrier dynamics model

, 2007
We have developed a theoretical model to analyze the anomalous cooling of radiative quantum dot (QD) excitons by THz radiation reported by Yusa et al [Proc. 24th ICPS, 1083 (1998)].
C. Wasshuber, Fredrik Boxberg, G. Yusa, Go Yusa, Hiroyuki Sakaki, J. Singh, Jukka Tulkki, O. Stier, S. Grosse   +8 more
core   +1 more source

Enhanced upconversion photoluminescence by novel plasmonic structures

, 2018
The emerging field of plasmon-enhanced upconversion photoluminescence has a significant impact on a variety of technologies, including high-efficiency solar energy systems and biotechnology. To date, the upconversion efficiency of best reported rare-earth doped upconversion nanoparticles cannot meet the requirements of practical utilizations in these ...
openaire   +3 more sources

Merging van der Waals Materials and Optical Metasurfaces for Cavity Quantum Electrodynamics

Nanophotonics, Volume 15, Issue 5, 16 March 2026.
Flat optical metasurfaces supporting quasi‐bound states in the continuum (qBIC) enable cavity‐like, high‐Q resonances in ultrathin nanostructures. This perspective explores the emergence of cavity quantum electrodynamics in qBIC metasurfaces, specifically those made from ultrathin van der Waals nanostructures, where cavities and emitters are seamlessly
Luca Sortino, Andreas Tittl, Stefan A. Maier   +2 more
wiley   +1 more source