Electrically controlled white laser emission through liquid crystal/polymer multiphases

Adamow, Alina; Szukalski, Adam; Sznitko, Lech; Persano, Luana; Pisignano, Dario; Camposeo, Andrea; Myśliwiec, Jarosław

doi:10.1038/s41377-020-0252-9

Cited by 39 publications

(27 citation statements)

References 48 publications

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“…For the stimulated emission test, the droplets thus produced were regarded as optical resonators, varied by the time of the homogenization process. The idea was to create a system on a widely referenced liquid crystal called 5CB, as it has already been successfully tested to create an emulsion with other laser dyes [ 43 ]. The 5CB matrix was also chosen to demonstrate the diversity of matrices that can be used to create host–guest systems with the perylene derivative presented here.…”

Section: Methodsmentioning

confidence: 99%

Perylene-Based Chromophore as a Versatile Dye for Light Amplification

et al. 2022

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One of the challenges for modern optoelectronics is to find versatile, easily adaptable components for novel laser-based technologies. A very attractive perylene-derivative chromophore in different organic matrices for high-performance light amplification is discussed and outlined. Our approach demonstrates the outstandingly compatible laser dye and a viable strategy to provide an effective optical gain for stimulated emission enhancement. Through structural control, we produce simple optical devices embedded in organic matrices, such as poly(methyl methacrylate), nematic liquid crystalline (NLC) mixture, and a hybrid emulsion system (poly(vinyl alcohol) PVA + NLC mesophase). Importantly, we investigate and compare the spectroscopy of differently constructed organic systems in terms of stimulated-emission thresholds and light amplification process efficiency. Moreover, we report the effects of tunability for LC cells by an applied external electric field stimulus. Future directions of laser systems are outlined with an emphasis on the role of the perylene derivative. The studies meet current challenges in the field of modern organic technologies dedicated to various optoelectronic systems, including touch screens, displays, and Li-Fi networks.

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Section: Methodsmentioning

confidence: 99%

Perylene-Based Chromophore as a Versatile Dye for Light Amplification

et al. 2022

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“…Laser-based white light becomes promising in auto, data projectors, and many other applications due to high brightness, fast response, and long transmission distance. [1][2][3][4][5][6][7] Combining blue laser diodes (LDs) with color converters is still the main method to construct white light similar to white light-emitting diodes (LEDs). [8][9][10][11] The order of magnitude higher power density of LD than that of LED launches a revolution in packaging technology for color converters.…”

Section: Introductionmentioning

confidence: 99%

High Efficiency Green‐Emitting LuAG:Ce Ceramic Phosphors for Laser Diode Lighting

Liu

et al. 2021

Advanced Optical Materials

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CP because it can be achieved white light directly combined with blue LDs. [19][20][21][22][23] Recently, yellow/green/red CPs were discovered to rich spectral components and modify the color quality for white LD lighting. [24][25][26][27][28] Lu 3 Al 5 O 12 :Ce (LuAG:Ce) is a well-known green color converter due to its high thermal stability and high efficiency. [29][30][31] LuAG:Ce CPs are regarded as the best type that is robust irradiated by high-power LD light (15-25 W, up to 49 W mm −2 ). [32][33][34][35][36] The luminous efficacy (LE) of LuAG:Ce CPs in LD lighting has been greatly enhanced from about 54 to 205 lm W −1 by designing geometric structures and introducing scattering centers. [32][33][34][35][36][37] However, LuAG CPs are usually sintered higher than 1700 °C, SiO 2 or TEOS is commonly added as sintering aid. [32][33][34] SiO 2 begins to react with the garnets at about 1400 °C, [38] and defects are inevitable due to the size and charge mismatches between Si 4+ and Lu 3+ /Al 3+ . [39] The defects decline the thermal stability that is directly related with the performance of LuAG:Ce in LD lighting. [19] Thus, how to depress the defect and maintain the high thermal stability is the hardest challenge in fabricating LuAG CPs and achieving high LE value.As we know, heavy atom can depress lattice relaxation and improve thermal stability. [40,41] Considering valence state, in this work, we design the Ba 2+ -Si 4+ pair to substitute the Lu 3+ -Al 3+ pair to keep charge balance. SiO 2 powder are used as sintering aid and BaCO 3 provides the Ba 2+ to control defects and adjust thermal stability. Combining annealing process in air to eliminate oxygen vacancies, LuAG:Ce CPs manifest high LE of 213.7-216.9 lm W −1 in LD lighting, which is the best performance up to date. These results demonstrate that suitable strategies further improve LuAG:Ce CPs properties, thus in turn making great contributions to high-brightness and efficient white LD lighting. The tunable thermal stability by Ba 2+ -Si 4+ pairs and relationships with performance of LuAG:Ce CPs in LD lighting are detailed in present report. Results and DiscussionNominal compositions of Lu 2.995−x Ba x Al 5−x Si x O 12 :0.005Ce (LuAG:0.5%Ce+xBS, x = 0, 0.005, 0.01, 0.015, and 0.02) CPs sintered in vacuum are dark yellow (unannealed samples in Figure 1a), especial for x = 0, due to a lot of color centers Lu 3 Al 5 O 12 :Ce 3+ (LuAG:Ce 3+ ) ceramic phosphors (CPs) are regarded as the most promising green color converter and play a key role in high quality white light in the next-generation laser diode (LD) lighting. High efficient LuAG:Ce 3+ CPs are still urgent for high luminous efficacy (LE) LD lighting devices. By designing the Ba 2+ -Si 4+ pair to keep charge balance and annealing in air to remove oxygen vacancy defects, the luminescent properties of LuAG:Ce CPs are greatly enhanced. The LE is promoted to 216.9 lm W −1 , which is the best performance of LuAG:Ce in LD lighting so far. Strategies for optimizing LuAG:Ce 3+ CPs are detailed. It is believed ...

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“…Among the many potential applications of doped PVA in high-tech photonics, we can list: highly diffractively efficient plates for holography or real time holography [11,12]; biocompatible microlasers (dye-doped PVA) based on polyvinyl alcohol microspheres [13]; white laser emission where the active material is composed of a solid polyvinyl alcohol matrix with a phase-separated liquid crystalline mixture [14]; LEDs, electroluminescence boards and plasma devices [15]; linear film polarizers in VIS domain (PVA sheets that are stretched and then dyed with iodine during the manufacturing process [16]), used in LCD displays or projection systems, and possibly even in UV domain [17]; wide-scale UV-VIS laser cut-off filters [18]; and so on.…”

Section: Introductionmentioning

confidence: 99%

Metal Doped PVA Films for Opto-Electronics-Optical and Electronic Properties, an Overview

Bulinski

2021

Molecules

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Polyvinyl alcohol is unique among polymers. Apart from its preparation, it is not built up in polymerization reactions from monomers, unlike most vinyl-polymers, and it is biodegradable in the presence of suitably acclimated microorganisms. It is an environmentally friendly material for a wide range of applications, from medical ones, based on its biocompatibility, to integrated optics. This paper reviews, in addition to the preparation and optimization of films of polyvinyl alcohol doped with different metal species, the role of dopants and doping technologies in the involved electronic mechanism. The optical properties were studied by UV-VIS-IR, Mössbauer spectroscopy, and other measurement techniques, with applications such as real-time holography, microlasers, optical sensors or nanophotonics in mind.

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Electrically controlled white laser emission through liquid crystal/polymer multiphases

Cited by 39 publications

References 48 publications

Perylene-Based Chromophore as a Versatile Dye for Light Amplification

Perylene-Based Chromophore as a Versatile Dye for Light Amplification

High Efficiency Green‐Emitting LuAG:Ce Ceramic Phosphors for Laser Diode Lighting

Metal Doped PVA Films for Opto-Electronics-Optical and Electronic Properties, an Overview

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