Off-Resonance Photosensitization of a Photorefractive Polymer Composite Using PbS Nanocrystals

Moon, Ji Yoon; Liang, Yichen; Stevens, Tyler E.; Monson, Todd C.; Huber, Dale L.; Mahala, Benjamin D.; Winiarz, Jeffrey G.

doi:10.1021/acs.jpcc.5b02915

Cited by 14 publications

(17 citation statements)

References 24 publications

(79 reference statements)

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“…More recently, PR performances for operation at 633 nm were reported for PVK/AODCST/ECZ with quantum dot PbS nanocrystals. PR performances were enhanced by off‐resonance photosensitization of PbS nanocrystals whose first excitonic transition lies at 1220 nm: internal diffraction efficiency exceeding 82%, optical gain coefficient of 211 cm −1 and response time of 34 ms were reported . PR photoconductors of star‐shaped molecular glasses endcapped with three or four Cz moieties were also reported .…”

Section: Photorefractive Materialsmentioning

confidence: 97%

Recent advances in photorefractive and photoactive polymers for holographic applications

Tsutsumi

2016

Polymer International

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The current state-of-the-art of photorefractive and photoactive polymers for holographic applications is summarized and reviewed. Photorefractive polymers and some kinds of photoactive materials based on the azobenzene chromophore have great potential for updatable holographic applications. Updatable three-dimensional holographic displays of large size have been developed using photorefractive polymers as well as photoactive azobenzene materials. Time responses of photorefractive polymers of the order of seconds and hundreds of milliseconds are currently improved to be of the order of milliseconds to hundreds of microseconds with high diffraction efficiency and high optical gain.

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Section: Photorefractive Materialsmentioning

confidence: 97%

Recent advances in photorefractive and photoactive polymers for holographic applications

Tsutsumi

2016

Polymer International

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“…Off-resonance photosensitized PR properties were investigated for PVK/AODCST/ECZ composite with quantum-dot PbS nanocrystals, 57 and a large optical gain of 211 cm −1 was obtained.…”

Section: Carbazole Trimermentioning

confidence: 99%

Molecular design of photorefractive polymers

Tsutsumi

2016

Polym J

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This review article describes the current state-of-the-art research on organic photorefractive polymer composites. A historical background on photorefractive materials is first introduced and is followed by a discussion on the opto-physical aspects and the mechanism of photorefractivity. The molecular design of photorefractive polymers and organic compounds is discussed, followed by a discussion on optical applications of the photorefractive polymers. Polymer Journal (2016) 48, 571-588; doi:10.1038/pj.2015.131; published online 27 January 2016 BACKGROUND In this report, the molecular design of organic photorefractive (PR) polymers is reviewed. Organic PR polymers are materials that possess both electro-optical and photoconductive properties. Research on photoconductive polymers, whose pioneering polymer is poly(N-vinyl carbazole) (PVK, PVCz), began in the 1960s. From the 1980s, research on organic nonlinear optical (NLO) materials has been widely conducted in the fields of organic electro-optics and optical nonlinearity. From the 1990s, new technology using organic photorefractivity combined with photoconductive and electro-optical properties was introduced in the field of organic semiconducting materials, 1 and organic light-emitting diodes 2-6 and organic fieldeffect transistors 7 were also debuted in this field. At the same time, the interest of researchers also turned toward the development of organic photovoltaic cells and organic solar cells. [8][9][10][11] The transport of charge carriers through photoconductive manifolds is a common phenomenon found in PR, organic light-emitting diode or organic photovoltaic materials. Thus, the development of materials in each field is expected to merge together to trigger the development of novel materials.The PR effect is a well-known phenomenon that is observed in materials in which refractive index modulation is induced by the space-charge field that results from the redistribution of positive and negative charge carriers separated through photo-excitation. 12 This phenomenon was first reported in inorganic crystals of lithium niobate (LiNbO 3 ) and lithium tantalate (LiTaO 3 ) and was observed through heterogeneous optically induced refractive indices in 1966. 13 Since then, the PR effect has extensively been investigated in many inorganic crystals, and theoretical approaches have been established to explain this phenomenon. 14 In 1991, 1 the first study of PR polymers reported a low diffraction efficiency of 10 −3 to 1% and a small optical gain of 0.33 cm À1 . In 1994, 15 a high diffraction efficiency of 86% (the remaining 14% was attributed to optical losses) and a large optical gain exceeding 200 cm À1 was reported in photoconductive PVK-based PR composites. Over the past two decades, many featured review articles [16][17][18][19][20][21][22][23][24][25][26][27] and book

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“…Semiconductor quantum dot (QD) emitters are widely used in various photonic and optoelectronic applications such as light-emitting devices, 1 solar cells, 2,3 photodetectors, 4 nanolasers, 5 single-photon sources, 6 and photorefractive devices. 7,8 Enhancing the spontaneous emission rates of QDs is essential for the fundamental research of quantum electrodynamics 9 and also important for the advancements in single photon sources and low-threshold photonic and plasmonic lasers. 10 QD spontaneous emission can be manipulated by engineering the local density of optical states and the cavity Purcell effect.…”

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confidence: 99%

Enhanced quantum dots spontaneous emission with metamaterial perfect absorbers

Wang

Yang

Luk

et al. 2019

Applied Physics Letters

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Metamaterial perfect absorbers (PAs) made of a hexagonal array of holes on Ag-SiO 2-Ag thin films have been realized and utilized to enhance the spontaneous emission rate and photoluminescence intensity of CdSe/ZnS quantum dots (QDs) spin-coated on the absorber top surface. Perfect absorption of incoming light occurs at the wavelength where the impedance is matched to that of the free space. When QDs strongly excite both the electric and magnetic resonances at this perfect absorption wavelength, a significant Purcell effect on the spontaneous emission process and enhanced radiative outcoupling of photoluminescence intensity are expected. For perfect absorbers with near-unity absorption at the QD emission wavelength of 620 nm, 5-fold Purcell enhancement of the spontaneous emission rate and 3.6-fold enhancement of photoluminescence intensity are demonstrated in the time-resolved photoluminescence experiments, which are in good agreement with three-dimensional finite-difference timedomain simulation. These results will advance the understanding and applications of metamaterial PA-based light harvesting and emitting devices.

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Off-Resonance Photosensitization of a Photorefractive Polymer Composite Using PbS Nanocrystals

Cited by 14 publications

References 24 publications

Recent advances in photorefractive and photoactive polymers for holographic applications

Recent advances in photorefractive and photoactive polymers for holographic applications

Molecular design of photorefractive polymers

Enhanced quantum dots spontaneous emission with metamaterial perfect absorbers

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