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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Fokina V. D., Bondarev V. S., Pogoreltsev E. I., Flerov I. N.
Заглавие : Efficiency of energy harvesting and storage using a multilayer capacitor based on BaTi0.86Sn0.14O3 ferroelectric lead-free ceramics
Место публикации : Ceram. Int. - 2022. - Vol. 48, Is. 22. - P.32966-32972. - ISSN 02728842 (ISSN), DOI 10.1016/j.ceramint.2022.07.227
Примечания : Cited References: 45
Аннотация: The study of the parameters of energy harvesting and storage in the lead-free solid solution BaTi0.86Sn0.14O3 (BTSnO) was performed. The permittivity shows the behavior similar to a diffuse phase transition with the critical exponent γ = 1.84, which is close to the value characteristic of relaxors. Large values of the recoverable energy density, Wrec=(5.8–7.0)∙104 J/m3, and the energy storage efficiency coefficient, η=(82–94) %, are implemented in a wide temperature range, 30–87°С, at a low electric field, E = 18.5 kV/cm. For the first time, the analysis of the Olsen cycle was performed using two phase diagrams: polarization – electric field and entropy – temperature. A fairly good agreement was found between the values of the energy conversion density, ND ≈ 0.15 J/cm3, which was determined using two approaches. A universal parameter is proposed for comparing the energy harvesting density for the materials studied in different ranges of temperature and electric fields.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gao P., Li Q., Li S., Gai S., Li Y., Ma Y., Zhang Z., Molokeev M. S., Zhou Z., Xia M.
Заглавие : Multiple strategies to approach high-efficiency luminescence controllable in blue/cyan/green-emitting Bi3+-activated phosphors
Место публикации : J. Phys. Chem. C. - 2022. - Vol. 126, Is. 21. - P.9195-9206. - ISSN 19327447 (ISSN), DOI 10.1021/acs.jpcc.2c02560
Примечания : Cited References: 53. - The authors would like to gratefully acknowledge funds from the National Natural Science Foundation of China (grant no. 51974123), the Distinguished Youth Foundation of Hunan Province (grant no.2020JJ2018), the Key R&D projects in Hunan Province (2020WK2016, 2020SK2032, 2021SK2047, and 2022NK2044), the Natural Science Foundation of Hunan Province, China (grant no. 2021JJ40261), the Hunan High Level Talent Gathering Project (2019RS1077 and 2020RC5007), the Scientific Research Fund of Hunan Provincial Education Department (19C0903), the Natural Sciences Foundation of Hunan Agricultural University, China (grant no. 19QN11), the Hunan Provincial Key Laboratory of Crop Germplasm Innovation and Resource Utilization Science Foundation (19KFXM12), the Changsha Science and Technology Plan (KH2005114, KH2201428), and the College Students’ Innovative Training (S202110537012)
Аннотация: Cyan gap is a major block in achieving high-quality white light-emitting diodes (WLEDs). Hence, a novel cyan-emitting phosphor Sr2GdGaO5/0.02Bi3+ with optical tuning performance is synthesized based on the local crystal field regulation strategy surrounding the luminescence center. With the substitution of Al3+ for Ga3+, the photoluminescence (PL) spectra of Sr2GdGa1–xAlxO5/0.02Bi3+ (0 ≤ x ≤ 1) phosphors adjust from cyan (466 nm) to blue (450 nm). Moreover, such a Ba2+ doping adjusts the PL spectra of Sr2–xBaxGdGaO5/0.02Bi3+ (0 ≤ x ≤ 0.5) phosphors from cyan (466 nm) to green (482 nm). These phenomena are contributed to the crystal field splitting and nephelauxetic effect. The energy transfer from Bi3+ to Eu3+ is realized by co-doping Bi3+ and Eu3+ ions in the A2GdBO5/Bi3+ (A = Sr, Ba; B = Ga, Al) host materials, and two single-phase white phosphors Sr2GdGaO5/0.02Bi3+, 0.05Eu3+ and Sr1.5Ba0.5GdGaO5/0.02Bi3+, 0.05Eu3+ are obtained. Finally, a WLED with high color rendering index (Ra = 93.6) is prepared by using red/green/blue (RGB) phosphors and Sr2GdGaO5/0.02Bi3+ phosphor, which is higher than that of the WLED prepared by RGB phosphors (Ra = 86.7), indicating that Sr2GdGaO5/0.02Bi3+ phosphor can close the cyan gap. These results provide multiple strategies in achieving luminescence controllable and WLED.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ren Q., Zhang J., Mao Y., Molokeev M. S., Zhou G., Zhang X. -M.
Заглавие : Ligand engineering triggered efficiency tunable emission in zero-dimensional manganese hybrids for white light-emitting diodes
Место публикации : Nanomaterials. - 2022. - Vol. 12, Is. 18. - Ст.3142. - ISSN 20794991 (ISSN), DOI 10.3390/nano12183142
Примечания : Cited References: 38. - This work was supported by the Natural Science Foundation of Shanxi Province (No. 20210302124054), National Natural Science Foundation of China (No. 21871167), Science and Technology Innovation Project of Colleges and Universities in Shanxi Province (No. 2021L262), 1331 Project of Shanxi Province and the Postgraduate Innovation Project of Shanxi Normal University (No.2021XSY040), and funded by RFBR according to the research project No. 19−52−80003
Аннотация: Zero-dimensional (0D) hybrid manganese halides have emerged as promising platforms for the white light-emitting diodes (w-LEDs) owing to their excellent optical properties. Necessary for researching on the structure-activity relationship of photoluminescence (PL), the novel manganese bromides (C13H14N)2MnBr4 and (C13H26N)2MnBr4 are reported by screening two ligands with similar atomic arrangements but various steric configurations. It is found that (C13H14N)2MnBr4 with planar configuration tends to promote a stronger electron-phonon coupling, crystal filed effect and concentration-quenching effect than (C13H26N)2MnBr4 with chair configuration, resulting in the broadband emission (FWHM = 63 nm) to peak at 539 nm with a large Stokes shift (70 nm) and a relatively low photoluminescence quantum yield (PLQY) (46.23%), which makes for the potential application (LED-1, Ra = 82.1) in solid-state lighting. In contrast, (C13H26N)2MnBr4 exhibits a narrowband emission (FWHM = 44 nm) which peaked at 515 nm with a small Stokes shift (47 nm) and a high PLQY of 64.60%, and the as-fabricated white LED-2 reaches a wide colour gamut of 107.8% National Television Standards Committee (NTSC), thus highlighting the immeasurable application prospects in solid-state display. This work clarifies the significance of the spatial configuration of organic cations in hybrids perovskites and enriches the design ideas for function-oriented low-dimensional emitters.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gao P., Li Q., Zhou C., Chen K., Luo Z., Zhang S., Molokeev M. S., Wang J., Zhou Z., Xia M.
Заглавие : High-efficiency continuous-luminescence-controllable performance and antithermal quenching in Bi3+-activated phosphors
Место публикации : Inorg. Chem. - 2022. - Vol. 61, Is. 33. - P.13104-13114. - ISSN 00201669 (ISSN), DOI 10.1021/acs.inorgchem.2c01784
Примечания : Cited References: 52. - The authors gratefully acknowledge funds from the National Natural Science Foundation of China (Grant 51974123), the Distinguished Youth Foundation of Hunan Province (Grant 2020JJ2018), the Key R&D Projects in Hunan Province (2020WK2016, 2020SK2032, 2021SK2047, and 2022NK2044), the Natural Science Foundation of Hunan Province, China (Grant 2021JJ40261), the Hunan High Level Talent Gathering Project (2020RC5007), Changsha Science and Technology Plan (KH2005114 and KH2201428), Hunan Graduate Scientific Research Innovation Project (2022XC017), and the College Students’ Innovative Training (s202210537079x)
Аннотация: Recently, Bi3+-activated phosphors have been widely researched for phosphor-converted light-emitting diode (pc-LED) applications. Herein, novel full-spectrum A3BO7:Bi3+ (A = Gd, La; B = Sb, Nb) phosphors with a luminescence-tunable performance were achieved by a chemical substitution strategy. In the La3SbO7 host material, a new luminescent center was introduced, with Gd3+ replacing La3+. The photoluminescence (PL) spectra show a large blue shift from 520 to 445 nm, thus achieving regulation from green to blue lights. Moreover, a series of solid solution-phase phosphors La3Sb1-xNbxO7:Bi3+ were prepared by replacing Sb with Nb, and a PL spectral tunability from green (520 nm) to orange-red (592 nm) was realized. Temperature-dependent PL spectra show that La3-xGdxSbO7:Bi3+ phosphors have excellent thermal stability. Upon 350 nm excitation, the PL intensity of La3-xGdxSbO7:Bi3+ phosphors at 150 °C remained at more than 93% at room temperature. With Gd3+ doping, the thermal stability gradually improved, and LaGd2SbO7:0.03Bi3+ represents splendid antithermal quenching (135.2% at 150 °C). Finally, a full-visible spectrum for pc-LED with a high color-rendering index (Ra = 94.4) was obtained. These results indicated that chemical substitution is an effective strategy to adjust the PL of Bi3+, which is of great significance in white-light illumination and accurate plant lighting.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bikbaev R. G., Pykhtin D. A., Vetrov S. Ya., Timofeev I. V., Shabanov V. F.
Заглавие : Nanostructured photosensitive layer for Tamm-plasmon-polariton-based organic solar cells
Место публикации : Appl. Opt. - 2022. - Vol. 61, Is. 17. - P.5049-5054. - ISSN 1559128X (ISSN), DOI 10.1364/AO.456413
Примечания : Cited References: 47. - Council on Grants of the President of the Russian Federation (MK-46.2021.1.2)
Аннотация: The influence of the volume fraction of plasmonic nanoparticles on the efficiency of the Tamm-plasmon-polariton-based organic solar cell is investigated in the framework of temporal coupled mode theory and confirmed by the transfer matrix method. It is shown that, unlike a conventional plasmonic solar cell, in which the efficiency is directly proportional to the volume fraction of nanoparticles in the photosensitive layer, the efficiency of the proposed solar cell reaches the highest value at low volume fractions. This effect is explained by the fact that at these volume fractions, the critical coupling condition of the incident field with the Tamm plasmon polariton is fulfilled. Thus, for the incoming radiation range of 350 to 500 nm, a maximal cell efficiency of 28% is achieved with a volume fraction of nanoparticles equal to 10%. Additionally, the optical properties of the photosensitive layer are compared for the cases of determining its complex refractive index by effective medium theory and the S-parameter retrieval method. A good agreement between the results is demonstrated, which encourages the use of the effective medium theory for preliminary calculations.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Aleksandrovsky A. S., Zaitsev A. I., Cherepakhin A. V., Vyunishev A. M., Rovsky V. E., Slabko V. V.
Заглавие : Nonlinear photonic crystals of strontium tetraborate: Properties and conversion of radiation
Место публикации : Proceedings of SPIE - The International Society for Optical Engineering. - 2010. - Vol. 7728: Nonlinear Optics and Applications IV (12 April 2010 through 15 April 2010, Brussels, ) Conference code: 81010. - ISBN 0277786X (ISSN); 9780819482013 (ISBN), DOI 10.1117/12.853713
Ключевые слова (''Своб.индексиров.''): nonlinear photonic crystal--second harmonic generation--strontium tetraborate--as-grown--average power--domain shape--efficiency enhancement--femtoseconds--fourth harmonics--nonlinear diffraction--nonlinear optical process--nonlinear photonic crystals--quasi-phase-matched--second harmonic generation--tetraborate--ti: sapphire laser--ti:sapphire oscillators--ferroelectricity--harmonic analysis--nonlinear optics--optical materials--photonic crystals--sapphire--strontium--harmonic generation
Аннотация: Random nonlinear photonic crystal (NPC) structures formed by as-grown domains in a non-ferroelectric strontium tetraborate (SBO) are investigated. The domain shape and orientation are similar to those in ferroelectric KTP. Nonlinear diffraction is the simplest way to detect, evaluate and characterize these structures. Reciprocal superlattice vectors spectra of NPC in SBO are very wide and enable broadband efficiency enhancement of nonlinear optical processes. Second harmonic (SH) generation of femtosecond Ti:sapphire oscillator radiation with 1.9% efficiency is obtained using nonlinear diffraction geometry. Random quasi phase matched generation at the wavelengths of fourth harmonic of Ti:sapphire laser is obtained with average power up to 1 ?W. © 2010 Copyright SPIE - The International Society for Optical Engineering.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pyatnov M. V., Bikbaev R. G., Timofeev I. V., Ryzhkov I. I., Vetrov S. Ya., Shabanov V. F.
Заглавие : Broadband Tamm plasmons in chirped photonic crystals for light-induced water splitting
Место публикации : Nanomaterials. - 2022. - Vol. 12, Is. 6. - Ст.928. - ISSN 20794991 (ISSN), DOI 10.3390/nano12060928
Примечания : Cited References: 41
Аннотация: An electrode of a light-induced cell for water splitting based on a broadband Tamm plasmon polariton localized at the interface between a thin TiN layer and a chirped photonic crystal has been developed. To facilitate the injection of hot electrons from the metal layer by decreasing the Schottky barrier, a thin n-Si film is embedded between the metal layer and multilayer mirror. The chipping of a multilayer mirror provides a large band gap and, as a result, leads to an increase in the integral absorption from 52 to 60 percent in the wavelength range from 700 to 1400 nm. It was shown that the photoresponsivity of the device is 32.1 mA/W, and solar to hydrogen efficiency is 3.95%.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Пятнов, Максим Владимирович, Тимофеев, Иван Владимирович
Заглавие : Фотоэлектрохимическое расщепление воды наноструктурированным электродом и зеленая водородная энергетика
Место публикации : Фотоника. - 2022. - Т. 16, Вып. 2. - С. 116-125. - ISSN 1993-7296 (ISSN), DOI 10.22184/1993-7296.FRos.2022.16.2.116.125; Photonics Rus. - ISSN 2686-844X (eISSN)
Примечания : Библиогр.: 28. - Исследование выполнено за счет гранта Российского научного фонда и Красноярского краевого фонда поддержки научной и научно-технической деятельности № 22-22-20078, https://rscf.ru/project/22-22-20078
Аннотация: В статье описан перспективный способ получения водорода – фотоэлектрохимическое расщепление воды. Этот подход сочетает непосредственное использование солнечной энергии и низкую стоимость производства фотоэлектрохимических ячеек из широко распространенных на Земле полупроводниковых материалов. Последние достижения в конструировании таких ячеек включают наноструктурирование полупроводниковых электродов плазмонными материалами.This article describes a promising hydrogen formation method, namely the photoelectrochemical water splitting. This approach combines the direct use of solar energy and low production cost of photoelectrochemical cells using the widely used semiconductor materials. The latest advances in such cell design include nanostructuring of the semiconductor electrodes with plasmonic materials.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Liu D., Li G., Dang P., Zhang Q., Wei Y., Qiu L., Molokeev M. S., Lian H., Shang M., Lin J.
Заглавие : Highly efficient Fe3+-doped A2 BB′O6 (A = Sr2+, Ca2+; B, B′ = In3+, Sb5+, Sn4+) broadband near-infrared-emitting phosphors for spectroscopic analysis
Место публикации : Light Sci. Appl. - 2022. - Vol. 11, Is. 1. - Ст.112. - ISSN 20955545 (ISSN), DOI 10.1038/s41377-022-00803-x
Примечания : Cited References: 50. - This work was financially supported by the National Natural Science Foundation of China (NSFC Nos. 51720105015, 51932009, 51929201, 52072349), the Projects for Science and Technology Development Plan of Jilin Province (20210402046GH), and the Natural Science Foundation of Zhejiang Province (LR22E020004)
Предметные рубрики: Optical properties of diamond
Inorganic LEDs
Аннотация: Near-infrared (NIR)-emitting phosphor-converted light-emitting diodes have attracted widespread attention in various applications based on NIR spectroscopy. Except for typical Cr3+-activated NIR-emitting phosphors, next-generation Cr3+-free NIR-emitting phosphors with high efficiency and tunable optical properties are highly desired to enrich the types of NIR luminescent materials for different application fields. Here, we report the Fe3+-activated Sr2−yCay(InSb)1−zSn2zO6 phosphors that exhibit unprecedented long-wavelength NIR emission. The overall emission tuning from 885 to 1005 nm with broadened full-width at half maximum from 108 to 146 nm was realized through a crystallographic site engineering strategy. The NIR emission was significantly enhanced after complete Ca2+ incorporation owing to the substitution-induced lower symmetry of the Fe3+ sites. The Ca2InSbO6:Fe3+ phosphor peaking at 935 nm showed an ultra-high internal quantum efficiency of 87%. The as-synthesized emission-tunable phosphors demonstrated great potential for NIR spectroscopy detection. This work initiates the development of efficient Fe3+-activated broadband NIR-emitting phosphors and opens up a new avenue for designing NIR-emitting phosphor materials.
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10.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Smorgon S. L., Zyryanov V. Ya., Shabanov V. F., Pozhidaev E. P.
Заглавие : Efficiency of light modulation by a polymer dispersed ferroelectric liquid crystals
Коллективы : International Meeting on Optics of Liquid Crystals
Место публикации : V International Meeting on Optics of Liquid Crystals: abstracts. - 1993. - P.117-118
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