Search query: Organic photo detector near infrared

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author_names: Xiang Liu

Emmanuel Jacques

Lei Wei

Tayeb Mohammed-Brahim
title: Visible and near infrared photo detector combining Polysilicon TFT and PbS quantum dots Semiconductor Technology for Ultra Large Scale Integrated Circuits and Thin Film Transistors VI
year: 2017

author_names: Tayeb Mohammed-Brahim

Emmanuel Jacques

Xiang Liu

Lei Wei
title: Visible and near infrared photo detector combining polysilicon TFT and PbS quantum dots
year: 2017

abstract: Abstract Photocatalytic splitting of water by titanium dioxide (TiO2) is considered as the most promising approach for the production of hydrogen fuel. However, a low utilization of the solar light spectrum still limits its photoconversion efficiency. Herein, two indeno[1,2 b]thiophene based organic sensitizers (S5 and S6) are used to sensitize TiO2 to significantly enhance photocatalytic hydrogen production by broadening the spectral response to near infrared light region. The results revealed that the average H2 evolution rates of S5@Pt/TiO2 and S6@Pt/TiO2 were 21.5 mmol g 1 h 1 and 7.2 mmol g 1 h 1, which were 11.3 and 3.9 fold than that of the Pt/TiO2 (1.85 mmol g 1 h 1) respectively. Compared with donor p acceptor (D p A) dye S6, donor acceptor p acceptor (D A p A) blue colored dye S5 possesses evident dominant in sensitizing TiO2, in which the auxiliary acceptor 2, 3 diphenylquinoxaline (QT) of S5 can effectively disperse donor electron distribution to improve the photo stability and weak the deprotonation effect to enhance light harvesting. More importantly, a highly apparent quantum efficiency (AQY) of 2.8% for S5@Pt/TiO2 was obtained at l 700 nm monochromatic light, which is, to the best of our knowledge, a recorded value among the pure organic dye sensitized TiO2 systems. This study offers important insights into the rational design of D A p A organic dye to sensitize TiO2 for highly efficient and stable photocatalytic hydrogen evolution.
author_names: Haoran Ding

Mengyu Xu

Shicong Zhang

Fengtao Yu

Kangyi Kong

Zhongjin Shen

Jianli Hua
title: Organic blue colored D A p A dye sensitized TiO2 for efficient and stable photocatalytic hydrogen evolution under visible/near infrared light irradiation
year: 2020

abstract: Radical anions of electron deficient systems are widely used, but are easily reoxidized upon exposure to air. Therefore, the stabilization of radical anions under ambient conditions is of great significance, but still remains a scientific challenge. Herein, perylenediimide is employed to prepare a crystalline metal organic framework for stabilizing radical anions without extensive chemical modification. The porous, three dimensional framework of perylenediimide can trap electron donors such as amine vapors and produce radical anions in situ through photo induced electron transfer. The radical anions are protected against quenching by shielding effect in air and remain unobstructed in air for at least a month. Because of the high yield and stability of the radical anions, which are the basis for near infrared photothermal conversion, the framework shows high near infrared photothermal conversion efficiency (e 52.3% The work provides an efficient and simple method towards ambient stable radical anions and affords a promising material for photothermal therapy.Perylenediimide (PDI) radical anions show promise as photothermal agents for phototherapy, but are typically very unstable. Here the authors fabricate a PDI based metal organic framework where the PDI units become stable radical anions upon incorporation of amine vapors.
author_names: Baozhong Lu

Yifa Chen

Pengyu Li

Bo Wang

Klaus Mullen

Meizhen Yin
title: Stable radical anions generated from a porous perylenediimide metal organic framework for boosting near infrared photothermal conversion
venue: Nature Communications
year: 2019

abstract: Microscopic imaging aided with fluorescent probes has revolutionized our understanding of biological systems. Organic fluorophores and probes thus continue to evolve for bioimaging applications. Fluorophores such as cyanines and hemicyanines emit in the near infrared (NIR) region and thus allow deeper imaging with minimal autofluorescence; however, they show limited photo and chemo stability, demanding new robust NIR fluorophores. Such photo and chemo stable NIR fluorophores, linear shape p extended rosol and rosamine analogues, are disclosed here which provide bright fluorescence images in cells as well as in tissues by confocal laser scanning microscopy. Furthermore, they offer unique ratiometric imaging platforms for activatable probes with dual excitation and dual emission capability, as demonstrated with a 2,4 dinitrophenyl ether derivative of benzo rosol.
author_names: Mingchong Dai

Ye Jin Reo

Chang Wook Song

Yun Jae Yang

Kyo Han Ahn
title: Development of photo and chemo stable near infrared emitting dyes: linear shape benzo rosol and its derivatives as unique ratiometric bioimaging platforms+
venue: Chemical science
year: 2020

abstract: Diabetes mellitus more commonly known as diabetes has been an on going problem around the world for many years now and the number of diabetics is expected to rise to 366 million globally by 2030 (Amir,2007) One of the measures of controlling this disease is daily monitoring of blood sugar level. The most common method of blood glucose level measurement involves pricking the finger which when done every day can be quite painful. Thus a non invasive glucose monitoring device is a welcome alternative. The non invasive blood glucose meter designed and fabricated in this study composed of a circuit consisting two LEDs of the same wavelength (LED pair) with one acting as a photo emitter and the other as a photodiode photo detector. Several LED pairs of different colors were tested for sensitivity to different glucose concentrations. Finger phantom tests were also done on the best LED pair. Out of all the LED pairs tested, the one that exhibited marked sensitivity to different glucose concentrations was the near infrared LED (NIR LED) pair with wavelength of 1450nm. The NIR LED pair showed consistently increasing trend on the output voltage vs. glucose concentration (Chua and Gonzales,2013)
author_names: Christopher Dale Chua

Ian Mikhael Gonzales

Enrique Manzano

Maria Carla Manzano
title: Design and Fabrication of a Non Invasive Blood Glucometer Using Paired Photo Emitter and Detector Near Infrared LEDs
year: 2014

abstract: We combine a low dark current and high detectivity near infrared (NIR) sensitive organic photodetector with a high resolution 508 pixels per inch (ppi) oxide thin film transistor (TFT) backplane to create a large area thin NIR detector, using processes that are compatible with flat panel display fabrication. The detector is characterized showing high uniformity and linearity. With the use of a NIR light source, the detector is capable of imaging the (pattern of) veins under the skin in reflection, leading to improved biometric authentication.
author_names: Daniel Tordera

Bart Peeters

Ezequiel Delvitto

Santhosh Kumar Shanmugam

Joris Maas

Joris de Riet

Roy Verbeek

Robert van de Laar

Thijs Bel

Gerard de Haas

Leslye Ugalde

Albert van Breemen

Ilias Katsouras

Auke Jisk Kronemeijer

Hylke Akkerman

Eric A Meulenkamp

Gerwin H Gelinck
title: Vein detection with near infrared organic photodetectors for biometric authentication
year: 2020

abstract: Development of organic theranostic agents that are active in the second near infrared (NIR II, 1000 1700 nm) biowindow is of vital significance for treating deep seated tumors. However, studies on organic NIR II absorbing agents for photo to heat energy converting theranostics are still rare simply because of tedious synthetic routes to construct extended p systems in the NIR II region. Herein, we design a convenient strategy to engineer highly stable organic NIR II absorbing theranostic nanoparticles (Nano BFF) for effective phototheranostic applications via co assembling first NIR (NIR I, 650 1000 nm) absorbing boron difluoride formazanate (BFF) dye with a biocompatible polymer, endowing the Nano BFF with remarkable theranostic performance in the NIR II region. In vitro and in vivo investigations validate that Nano BFF can serve as an efficient theranostic agent to achieve photoacoustic imaging guided deep tissue photonic hyperthermia in the NIR II biowindow, achieving dramatic inhibition toward orthotopic hepatocellular carcinoma. This work thus provides an insight into the exploration of versatile organic NIR II absorbing nanoparticles toward future practical applications. Organic agents with activity in the second near infrared region (NIR II) are needed for precise treatment of cancer. Here, the authors develop boron difluoride formazanate nanosystem as a theranostic agent active in the NIR II region for treating deep seated hepatocellular carcinoma in mice.
author_names: Huijing Xiang

Lingzhi Zhao

Luodan Yu

Hongzhong Chen

Chenyang Wei

Yu Chen

Yanli Zhao
title: Self assembled organic nanomedicine enables ultrastable photo to heat converting theranostics in the second near infrared biowindow
venue: Nature communications
year: 2021

abstract: Abstract Organic phototransistor (OPT) is a promising photodetector with substantial attention due to its advantages such as low cost, light weight, flexibility and ease of large area preparation. Although the second near infrared (NIR II) window (1.0 1.7 mm) has important applications in fiber communication, the organic infrared photosensitive materials are scarce in this waveband, which greatly limits the application of organic photodetectors in near infrared bands. In this work, a charge transfer complex (CTC) film with significant hyperchromic effect in the infrared range of 1000 1400 nm was prepared by co evaporation of metal oxide WO3 and organic molecule m MTDATA. A high performance near infrared OPT was fabricated by combining this CTC photosensitive layer and pentacene (PENT) high mobility channel layer, the photoresponsivity R of which has surpassed the recent reported level of 1.1 mm band inorganic infrared detector. The physical mechanism underlying the operation of CTC PENT OPT was clarified and the thickness of the CTC photosensitive film in this device was optimized. This new type of organic inorganic CTC infrared sensitive material will offer a new choice for the future study on organic infrared detectors.
author_names: Haonan Wang

Shiyan Liu

Yinchang Li

Xiaofeng Yue

Yifan Shen

Haiyang Xu

Haitao Xu

Yongsheng Tan

Liya Zeng

Bo Yao

Ze Bo Fang
title: Near infrared II photodetection realized by introducing organic inorganic charge transfer complex photosensitive material into pentacene phototransistor
year: 2020

abstract: Diazocines are bridged azobenzenes with superior photo physical properties. In contrast to azobenzenes the Z configuration is thermodynamically stable and the E isomer is metastable. We present a new class of nitrogen bridged diazocines with bathochromically shifted switching wave lengths and remarkably high quantum yields (NH CH2 bridged diazocine: PhZ E=0.57, PhE Z=0.8) Z to E isomerization is induced by irradiation with blue light, whereas switching back to the Z isomer is accomplished with light in the near infrared window (up to 740 nm) which is im portant for medical applications like photopharmacology (deep tissue penetration) Furthermore, substitution at the bridge nitrogen should provide access to widely applicable tricyclic, photoswitchable pharmacophores. The CH2 NAc bridged derivative is soluble in water and all photophysical properties (conversion rates, quantum yields and thermal half lives) are largely retained. Hence, this diazocine is an ideal photoswitch for applications in biochemical systems and in photopharmacology.
author_names: Pascal Lentes

Eduardo Stadler

Fynn Roehricht

Arne Brahms

Jens Groebner

Frank D Sonnichsen

Georg Gescheidt

Rainer Herges
title: Nitrogen Bridged Diazocines: Photochromes Switching within the Near Infrared Region with High Quantum Yields in Organic Solvents and in Water.
venue: Journal of the American Chemical Society
year: 2019