Hybrid fluorescent layer emitting polarized light

Mohammadimasoudi, Mohammad; Beeckman, Jeroen; Hens, Zeger; Neyts, Kristiaan

doi:10.1063/1.4991029

Cited by 10 publications

(12 citation statements)

References 27 publications

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“…Controlling the photoluminescent properties of luminescent materials has been given attention due to their potential applications in liquid crystal displays (LCDs), polarized light emitting displays, and other optoelectronic devices. − Among them, controllable polarized luminescence is of great importance in backlighting LCDs and polarized luminescent devices. − Until now, a large variety of organic and inorganic luminescent materials, including monomeric and polymeric-conjugated materials and inorganic luminescence nanoparticles, have been extensively studied for achieving polarized luminescence emission. − To realize the polarized luminescence, it is generally required to induce luminescent materials into an ordered bulk media.…”

Section: Introductionmentioning

confidence: 99%

Photoinduced Dual-Mode Luminescent Patterns in Dicyanostilbene-Based Liquid Crystal Polymer Films for Anticounterfeiting Application

et al. 2019

ACS Appl. Polym. Mater.

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Tunable photoluminescence is highly favored for its unique in light emitting displays, bioimaging, and optoelectronic device fields. Here, a photoinduced dual-mode luminescent pattern in the dicyanostilbene monomer (DCN-M)-based liquid crystal polymer (LCP) films is first proposed by combining a photoinduced alignment with a photoisomerization reaction. The high polarized emission patterns at microscopic and macroscopic scale are first achieved by employing sulfonic azo dye (SD1) as an alignment agent to control the local orientation of highly emissive DCN-M in LCP matrix. Furthermore, by taking advantage of Z/E photoisomerization of the dicyanostilbene moiety in the DCN-M-doping LCP film, the photoluminescence intensity of the LCP film could be tuned upon nonpolarized ultraviolet light irradiation, thus enabling alternating light and dark regions in the LCP film. Finally, we proposed a proof-of-concept demonstration of a dual-mode emission pattern in a single LCP film for an anticounterfeiting application with modulation of both polarization and photoluminescence intensity. This work paves a new way for the fabrication of complex patterned fluorescent polymers for photonic applications.

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Section: Introductionmentioning

confidence: 99%

Photoinduced Dual-Mode Luminescent Patterns in Dicyanostilbene-Based Liquid Crystal Polymer Films for Anticounterfeiting Application

et al. 2019

ACS Appl. Polym. Mater.

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“…For example, one of the current trends in LCD technology is to utilize spherical QD dispersed in a polymer layer and illuminated by blue LEDs to generate narrow-band green or red light. , However, a substantial part of the QD emission is lost in the display polarizer. A high degree of polarization can be obtained by using aligned dot-in-rods, ,, but these mainly harvest blue photons of the same polarization. Therefore, the cross particle may provide the required combination of highly polarized emission with efficient absorption for both polarizations (Figure e, top).…”

Section: Resultsmentioning

confidence: 99%

“…2,33 However, a substantial part of the QD emission is lost in the display polarizer. A high degree of polarization can be obtained by using aligned dot-in-rods, 6,7,32 but these mainly harvest blue photons of the same polarization. Therefore, the cross particle may provide the required combination of highly polarized emission with efficient absorption for both polarizations (Figure 4e, top).…”

Section: Acs Photonicsmentioning

confidence: 99%

“…Semiconductor nanoparticles serve as a versatile platform to study different phenomena of light–matter interaction. Besides having distinct quantum and nonlinear optical properties, these nanocrystals exhibit size-tunable absorption , and optically stable emission. , Such characteristics have led them to diverse applications, ranging from living cell labeling and biosensing to single-photon light sources, , light-emitting diodes, displays , and solar energy devices. , However, the lack of freedom to control the polarization anisotropy and wave vector anisotropy for absorption and emission of photons by SNP still limits their efficient implementation in these fields.…”

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confidence: 99%

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Contrasting Anisotropy of Light Absorption and Emission by Semiconductor Nanoparticles

2019

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Photon absorption and emission play a key role in our understanding of how light interacts with matter. An attractive system to explore these processes are semiconductor nanoparticles (SNP) with their distinguishable photoluminescence, which makes them widely applied in optoelectronics, laser technology, and biophotonics. In current implementations of SNP, there is only partial control over anisotropy in absorption or in emission, which limits their applicability in photonics. An emerging strategy to attain a certain degree of anisotropy is to embed a quantum dot in semiconductor shell structure. Here, we report how designing the shell geometry and the position of the quantum dot enables extended control over the anisotropy in absorption and emission by a core/shell nanoparticle in a solvent. Based on the dielectric effect, our approach provides an accessible route to achieve sharply contrasting anisotropies that may even have an opposite sign. Using this unique feature, we propose cross particles to transform unpolarized blue light into polarized red and green light for liquid crystal backlights and thumbtack particles to absorb sunlight and efficiently emit photons in a solar concentrator. The strong anisotropic contrast between absorption and emission of SNP may advance energy-efficient technology, biodiagnostics, and quantum information, as well as offer new insights on light–matter interaction at the nanoscale.

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“…Fluorescent semiconductor quantum rods (QRs) are brought into focus and applied in many photoelectric devices including liquid crystal (LC) display backlights [1], [2]- [4], LC cells [4]- [6], light emitting diodes (LEDs) [7]- [9], microcavities and lasers [10]- [14], solar cells [15]- [17], luminescent solar concentrators (LSC) [18]- [20], and other applications including photocatalytic hydrogen generation [21]- [23] and bioimaging [24]- [27]. Because there are a lot of outstanding properties of QRs covering tunable emission, polarized emission, narrow full width at half maximum (FWHM), and large quasi-Stokes shift [20], [28], [29].…”

Section: Introductionmentioning

confidence: 99%

Highly Polarized Fluorescent Film Based on Aligned Quantum Rods by Contact Ink-Jet Printing Method

et al. 2019

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In recent years, fluorescent quantum rods (QRs) receive much attention because of their properties of emitting specific wavelength polarized light with narrow full width at half maximum (FWHM). Therefore, QRs are usually aligned on devices, such as light emitting diodes, laser, and liquid crystal display (LCD), as a polarizer. In order to emit the light with a high degree of polarization (DOP), QRs need to be controlled and aligned almost along one direction on large-scaled devices. However, most of the proposed effective alignment approaches cannot be applied to a large area. Hence, we firstly propose the contact ink-jet printing (CIJP) method to align CdSe/CdS core/shell QRs. With the ink being printed, the QRs can move driven by ink flowing. Eventually, the QRs will be aligned along the printed trajectories and become a film with DOP of more than 40%. Furthermore, CIJP can realize arbitrarily large area fabrication without reducing DOP value. In the future, this method can be utilized to print on large-scaled substrates directly to fabricate polarized optoelectronic devices, and further applied to LCD backlights and optical lenses.

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Hybrid fluorescent layer emitting polarized light

Cited by 10 publications

References 27 publications

Photoinduced Dual-Mode Luminescent Patterns in Dicyanostilbene-Based Liquid Crystal Polymer Films for Anticounterfeiting Application

Photoinduced Dual-Mode Luminescent Patterns in Dicyanostilbene-Based Liquid Crystal Polymer Films for Anticounterfeiting Application

Contrasting Anisotropy of Light Absorption and Emission by Semiconductor Nanoparticles

Highly Polarized Fluorescent Film Based on Aligned Quantum Rods by Contact Ink-Jet Printing Method

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