Integrated tandem device with photoactive layer for near-infrared to visible upconversion imaging

He, Shou-Jie; Wang, Dengke; Yang, Zhenxin; Man, Jiaxiu; Lu, Zheng‐Hong

doi:10.1063/1.5023430

Cited by 20 publications

(10 citation statements)

References 24 publications

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“…The 750-nm short-pass filters (15-262, Edmund Optics) were prepared for the sensitive PMT to accurately capture the electroluminescence spectra avoiding the undesired saturation by the high-intensity laser. Infrared-to-visible upconversion efficiency can then be evaluated according to the following equationnormalηp−p.1emfalse(normal%false)=normal#.1emphotonVISnormal#.1emphotonNIR=∫λupIupfalse(normalλfalse)hcdnormalλ/λincPinchc=normal#.1emelectronnormalλnormalincPnormalinchc×∫λupIupfalse(normalλfalse)hcdnormalλnormal#.1emelectronwhich describes the utilization rate of incoming infrared photons for visible photons ( 48 , 49 ). h and c are the Planck constant and the speed of light in the vacuum.…”

Section: Methodsmentioning

confidence: 99%

which describes the utilization rate of incoming infrared photons for visible photons ( 48 , 49 ). h and c are the Planck constant and the speed of light in the vacuum.…”

Section: Methodsmentioning

confidence: 99%

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Transparent organic upconversion devices displaying high-resolution, single-pixel, low-power infrared images perceived by human vision

et al. 2023

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Crystalline photodiodes remain the most viable infrared sensing technology of choice, yet the opacity and the limitation in pixel size reduction per se restrict their development for supporting high-resolution in situ infrared images. In this work, we propose an all-organic non-fullerene–based upconversion device that brings invisible infrared signal into human vision via exciplex cohost light-emissive system. The device reaches an infrared-to-visible upconversion efficiency of 12.56% by resolving the 940-nm infrared signal (power density of 103.8 μW cm −2 ). We tailor a semitransparent (AVT, ~60%), large-area (10.35 cm 2 ), lightweight (22.91 g), single-pixel upconversion panel to visualize the infrared power density down to 0.75 μW cm 2 , inferring a bias-switching linear dynamic range approaching 80 dB. We also demonstrate the possibility of visualizing low-intensity infrared signals from the Face ID and LiDAR, which should fill the gap in the existing technology based on pixelated complementary metal-oxide semiconductors with optical lenses.

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Section: Methodsmentioning

confidence: 99%

which describes the utilization rate of incoming infrared photons for visible photons ( 48 , 49 ). h and c are the Planck constant and the speed of light in the vacuum.…”

Section: Methodsmentioning

confidence: 99%

Transparent organic upconversion devices displaying high-resolution, single-pixel, low-power infrared images perceived by human vision

et al. 2023

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“…Taking a step forward, a tandem organic upconverter was designed by sandwiching a charge generation layer between two phosphorescent OLEDs (see Figure 4) [41]. The idea of a tandem upconverter is that the photogenerated electron is driven in the first OLED, and the photogenerated hole is driven into the second OLED.…”

Section: All-organic Upconvertersmentioning

confidence: 99%

“…CGL denotes charge-generation layer, ICL is a thin intermediate connecting layer that assists the photoelectron injection into the first OLED. Reproduced with permission from Ref[41], Copyright 2018 AIP; c) Molecular structures, device layer stack and schematic energy level diagram of an upconverter with a photon conversion efficiency of over 100%. Reproduced with permission from Ref [43],.…”

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confidence: 99%

Recent advances with optical upconverters made from all-organic and hybrid materials

Hany

Cremona

Strassel

2019

Science and Technology of Advanced Materials

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The growing interest in near-infrared (NIR) imaging is explained by the increasing number of applications in this spectral range, which includes process monitoring and medical imaging. NIR-to-visible optical upconverters made by integrating a NIR photosensitive unit with a visible emitting unit convert incident NIR light to visible light, allowing imaging of a NIR scene directly with the naked eye. Optical upconverters made entirely from organic and hybrid materialswhich include colloidal quantum dots, and metal-halide perovskitesenable low-cost and pixel-free NIR imaging. These devices have emerged as a promising addition to current NIR imagers based on inorganic semiconductor photodiode arrays interconnected with read-out integrated circuitry. Here, we review the recent progress in the field of optical upconverters made from organic and hybrid materials, explain their functionality and characterization, and identify open challenges and opportunities.

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“…Great progress is being made with upconverters fabricated entirely from organic and hybrid materials, which include metal-halide perovskites and colloidal quantum dots. − In particular, the fraction of incident NIR photons converted to visible photons, the photon-to-photon conversion efficiency (P2PCE), is an important performance metrics. By using different material systems and device architectures, the P2PCE has rapidly increased from 2.7% in 2010 to 29.6% and over 100% in 2018.…”

Section: Introductionmentioning

confidence: 99%

Solution-Processed Organic Optical Upconversion Device

Strassel

Ramanandan

Abdolhosseinzadeh

et al. 2019

ACS Appl. Mater. Interfaces

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Imaging in the near-infrared (NIR) is getting increasingly important for applications such as machine vision or medical imaging. NIR-to-visible optical upconverters consist of a monolithic stack of a NIR photodetector and a visible light-emitting unit. Such devices convert NIR light directly to visible light and allow capturing a NIR image with an ordinary camera. Here, five-layer organic solution-processed upconverters (OUCs) are reported which consist of a squaraine dye NIR photodetector and a fluorescent poly(para-phenylene vinylene) copolymer (super yellow)-based organic light-emitting diode (OLED) or light-emitting electrochemical cell (LEC), respectively. Both OLED–OUCs and LEC–OUCs convert NIR light at 980 nm to yellow light at around 575 nm with comparable device metrics of performance, such as a turn-on voltage of 2.7–2.9 V and a NIR-to-visible photon conversion efficiency of around 1.6%. Because of the presence of a salt in the emitting layer, the LEC–OUC is a temporally dynamic device. The LEC–OUC turn-on and relaxation behavior is characterized in detail. It is demonstrated that a particular ionic distribution and thereby the LEC–OUC status can be frozen by storing the device in the presence of a small voltage applied. This provides a test chart for quantitative measurements.

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Integrated tandem device with photoactive layer for near-infrared to visible upconversion imaging

Cited by 20 publications

References 24 publications

Transparent organic upconversion devices displaying high-resolution, single-pixel, low-power infrared images perceived by human vision

Transparent organic upconversion devices displaying high-resolution, single-pixel, low-power infrared images perceived by human vision

Recent advances with optical upconverters made from all-organic and hybrid materials

Solution-Processed Organic Optical Upconversion Device

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