Shortwave Infrared Light Detection and Ranging Using Silver Telluride Quantum Dots

Advanced Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 31, 2025

Abstract Shortwave infrared (SWIR) light, characterized as the “eye‐safe” window, is considered extremely promising in various technological fields and particularly valuable for imaging light detection ranging (LiDAR) applications. Silver telluride (Ag 2 Te) colloidal quantum dots (CQDs), featuring RoHS‐compliance, solution‐processability, CMOS compatibility, emerge a potential contender SWIR optoelectronics. Yet, further improvements dark current, response speed, linear dynamic range (LDR) are essential meeting rigorous demands of sensing LiDAR Here, it shown that post‐synthesis surface engineering doping control significantly improve LDR Ag₂Te CQD photodiodes, achieving low current 450 nA cm − at −0.5 V, an exceeding 150 dB, rapid speed ≈25 ns. A proof‐of‐concept demonstration using practical nanosecond diode laser achieves decimetre‐level resolution distance 10 m. This work represents key step advancing CQDs toward consumer electronics automotive markets.

Language: Английский

---

Colloidal InAs Quantum Dots: Synthesis, Properties, and Optoelectronic Devices

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 12, 2025

Abstract Colloidal indium arsenide (InAs) quantum dots (QDs) have emerged as a compelling class of advanced low‐dimensional materials due to their excellent near‐infrared (NIR) optical properties and compliance with restriction hazardous substances (RoHS) standard, showing great potential in various photovoltaics, light emission/conversion, sensing applications. Here, variety synthetic techniques for preparing high‐quality InAs QDs, including hot‐injection, seeded growth cation exchange, are thoroughly reviewed. To realize tailored optoelectronic properties, diverse strategies such surface passivation, doping, alloying, shape control QDs discussed detail, which applicable fabricate high‐performance QDs‐based devices, encompassing solar cells, light‐emitting diodes, photodetectors field‐effect transistors. Moreover, the main challenges future research directions briefly proposed, providing guidelines achieve low‐cost, heavy metal‐free, high‐efficiency stable NIR optoelectronics toward commercialization.

Language: Английский

---

Chemical Reactivity‐Controlled Synthesis of Silver Chalcogenide Colloidal Quantum Dots for Efficient Shortwave Infrared Photodetectors

Small, Journal Year: 2025, Volume and Issue: unknown

Published: March 30, 2025

Abstract Eco‐friendly Ag 2 Te colloidal quantum dots (CQDs) have emerged as promising candidates for shortwave infrared (SWIR) optoelectronic applications owing to their size‐tunable bandgaps with high optical properties. However, conventional synthesis methods relying on temperatures and long reaction times yield low‐quality CQDs because of low chemical stability, resulting in decomposition under synthetic conditions and, thus, a non‐uniform size distribution. Here, reactivity‐controlled is presented regulate the crystal bandgap CQDs. This involves adjusting concentration type ligands, well precursor ratio. The rapid termination this method prevents CQD decomposition, yielding monodisperse 1.66 peak‐to‐valley ratio at first exciton absorption peak (≈1440 nm) enabling emission 1100−1600 nm range. Furthermore, polar antisolvents purification process cause surface ligand removal from CQDs, defects aggregation. To mitigate these issues by enhancing core/shell‐type Te/Ag S are synthesized. photoluminescence (PL) intensity significantly increased fivefold compared core after purification, distribution remained uniform preserved PL intensity. attributed significant reduction defects. Consequently, CQD‐based SWIR photodetector exhibits external efficiency 8.4% specific detectivity 1.1 × 10 11 Jones 1550 nm, fast response time 38 ns.

Language: Английский

---

pH-responsive nanovesicles capable of remodeling the tumor microenvironment enable activatable Near-Infrared-II fluorescence image-guided enhanced radiotherapy

Materials Today Bio, Journal Year: 2025, Volume and Issue: unknown, P. 101725 - 101725

Published: April 1, 2025

Traditional radiotherapy (RT) lacks the precision to distinguish between tumor and normal tissues, leading inevitable X-ray-induced side effects in patients. Therefore, it is crucial develop integrated imaging therapeutic modalities that can reduce on surrounding healthy tissues while enhancing susceptibility tissues. In this study, we developed a pH-responsive nanodrug (AuNRs-Mn3O4-Ag2S Ve) by self-assembling second near-infrared (NIR-II, 950-1700 nm) fluorescent probe Ag2S quantum dots (QDs), multifunctional nanozyme Mn3O4 nanoparticles (NPs), radiosensitizer gold nanorods (AuNRs) into single nanoplatform via an emulsion process. This enables precise localization for accurately guided RT multi-angle sensitization of RT. Upon intravenous administration, disintegrates area due pH-sensitive polymer P4VP, releasing QDs which are specifically activated acidic environment, thereby "turning on" NIR-II fluorescence signal. The optimal timing signal within region after injection was investigated, providing reference vitro vivo experiments confirmed efficient enhancement radiosensitization AuNRs NPs. specific modality transitions from "off" "on" has been successfully implemented, addressing limitations conventional radiosensitivity. integration approaches study presents promising image-guided

Language: Английский

---