Synthesis and luminescence of Mn-doped Cs2AgInCl6 double perovskites

2018 ◽  
Vol 54 (41) ◽  
pp. 5205-5208 ◽  
Author(s):  
Nila Nandha K. ◽  
Angshuman Nag
Keyword(s):  
Visible Region ◽  
Double Perovskite ◽  
Wide Bandgap ◽  
Double Perovskites ◽  
Mn Doped

Mn2+ has been doped in a wide bandgap Cs2AgInCl6 double perovskite to emit light in the visible region.

Band gap modulation and improved magnetism of double perovskite Sr2KMoO6 (K = Fe, Co, Ni, Mn) doped BaTiO3 ceramics

2021 ◽  
Author(s):  
Jianxin Chen ◽  
Hongmei Deng ◽  
Yanlin Pan ◽  
Dongliang Zheng ◽  
Lin Sun ◽  
...  
Keyword(s):  
Band Gap ◽  
Double Perovskite ◽  
Band Gap Modulation ◽  
Mn Doped

Effect of Different Catalysts and Growth Temperature on the Photoluminescence Properties of Zinc Silicate Nanostructures Grown via VLS Method

2021 ◽  
Author(s):  
Ghfoor Muhammad ◽  
Imran Murtaza ◽  
Rehan Abid ◽  
Naeem Ahmad
Keyword(s):  
Energy Levels ◽  
Visible Region ◽  
Wide Bandgap ◽  
Visible Spectral Range ◽  
Zinc Silicate ◽  
Band Spectrum ◽  
Photoluminescence Properties ◽  
Display Devices ◽  
Crystal Growth Kinetics ◽  
Potential Applications

Abstract Herein, we explore the photoluminescence properties of zinc silicate (Zn2SiO4) nanostructures synthesized by vapor-liquid-solid (VLS) mode of growth using three different catalysts (Sn, Ag and Mn). Different catalysts significantly influence the growth rate which in turn has an impact on the structure and hence the photoluminescence of the prepared zinc silicate nanostructures. Zn2SiO4 has a wide bandgap of about 5.5 eV and in its pure form, it does not emit in visible region due to its inner shell electronic transitions between the 3d5 energy levels. However, the incorporation of different catalysts (Sn, Ag and Mn) at different growth temperatures into the Zn2SiO4 crystal growth kinetics provides wide visible spectral range of photoluminescence (PL) emissions. PL analysis shows broad multi-band spectrum in the visible region and distinct colours (red, yellow, green, blue, cyan and violet) are obtained depending on the crystalline structure of the prepared nanostructures. The allowed transitions due to the effect of different catalysts on zinc silicate lattice offer a huge cross-section of absorption that generates strong photoluminescence. The correlation between the structural and optical properties of the synthesized nanostructures is discussed in detail. The synthesized photoluminescent nanostructures have potential applications in solid-state lighting and display devices.

Cs2AgBiBr6−xClx solid solutions – band gap engineering with halide double perovskites

2019 ◽  
Vol 7 (31) ◽  
pp. 9686-9689 ◽  
Author(s):  
Matthew B. Gray ◽  
Eric T. McClure ◽  
Patrick M. Woodward
Keyword(s):  
Solid Solution ◽  
Band Gap ◽  
Solid Solutions ◽  
Double Perovskite ◽  
Double Perovskites ◽  
Band Gap Engineering ◽  
Vegard’S Law ◽  
Upward Deviation

The halide double perovskite solid solution Cs2AgBiBr6−xClx has been investigated and found to exhibit a band gap that increases from 2.2 eV to 2.8 eV as the Cl− content increases, with an upward deviation from Vegard's law when x > 5.

Characterization of Antiferromagnetism in Double Perovskites Ba2FeMoO6 Prepared by Solid State Method

2019 ◽  
Vol 891 ◽  
pp. 224-229
Author(s):  
Naphat Albutt ◽  
Vanussanun Aitviriyaphan ◽  
Thanapong Sareein ◽  
Sudarath Suntaropas ◽  
Panakamon Thonglor ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Solid State ◽  
Solid State Reaction ◽  
Double Perovskite ◽  
Solid State Reaction Method ◽  
Double Perovskites ◽  
Solid State Method ◽  
Reaction Method ◽  
State Method

The magnetic properties of Ba2FeMoO6 (BFMO) double perovskite are investigated. BFMO samples were prepared by solid state reaction method through compression. Magnetic properties are influenced by electron environments of the Fe3+ and Mo5+ ions within the perovskite structure. BFMO sintered at 800 oC exhibited the largest hysteresis loop at 50 K. In addition, the values of Ms and Mr indicate ferromagnetic behaviour in BFMO ceramics sintered at 800 oC for different times up to 10 hours. Using the Curie-Weiss law fitting to investigate μeff~30μB high spin of Fe and Mo, and negative θ present the antiferromagnetic characteristics of the BFMO sample.

Benzoyl Halide as Alternative Precursor for Synthesis of Lead Free Double Perovskite Cs3Bi2Br9 Nanocrystals

2020 ◽  
Vol 20 (6) ◽  
pp. 3802-3808
Author(s):  
Ashish Kumar ◽  
S. S. Rawat ◽  
Sanjay Kumar Swami ◽  
Vidya Nand Singh ◽  
Ritu Srivastava
Keyword(s):  
Visible Region ◽  
Functional Materials ◽  
Double Perovskite ◽  
Luminescent Properties ◽  
Lead Free ◽  
Time Resolved ◽  
Injection Process ◽  
Vis Spectroscopy ◽  
Different Temperatures ◽  
Reduced Toxicity

Ternary bismuth halides are interesting functional materials closely related to Pb halide perovskite photovoltaic material, and are widely sought after due to reduced toxicity of Bi compared to Pb. There are several reports on synthesis of Cs3Bi2Br9 nanocrystals (NCs) due to its being relatively stable compared to lead perovskite. Cs3Bi2Br9 nanocrystals have been synthesised using benzoyl bromide as an precursor using hot injection process at two different temperatures of 120 °C and 160 °C. Samples have been characterized for its structural, optical, microstructural and luminescent properties using X-ray diffraction, (XRD) UV-Vis spectroscopy, high resolution transmission electron microscopy and photoluminescent spectroscopy. XRD showed formation of Cs3Bi2Br9 phase with mono-crystalline structure. UV-Vis showed two types of band gap in the visible region which shows that the material can be used for photovoltaic applications. HRTEM confined the particles to be composed of nanocrystals with ˜5 nm particles in the samples grown at 120 °C and it the particles joined together yield various structures composed of nanoparticles. The time resolved photoluminescence shows average life times of 3.067 ns and 4.761 ns for samples grown at two different temperatures. To the best of our knowledge, this is the first report where benzoyl halide has been used as alternative precursor for the synthesis of lead free double perovskite Cs3Bi2Br9 nanocrystals which have many applications.

scholarly journals Colloidal Synthesis of Double Perovskite Cs2AgInCl6 and Mn-Doped Cs2AgInCl6 Nanocrystals

2018 ◽  
Vol 140 (40) ◽  
pp. 12989-12995 ◽  
Author(s):  
Federico Locardi ◽  
Matilde Cirignano ◽  
Dmitry Baranov ◽  
Zhiya Dang ◽  
Mirko Prato ◽  
...  
Keyword(s):  
Double Perovskite ◽  
Colloidal Synthesis ◽  
Mn Doped

scholarly journals Deposition routes of Cs2AgBiBr6 double perovskites for photovoltaic applications

MRS Advances ◽  
2018 ◽  
Vol 3 (32) ◽  
pp. 1819-1823 ◽  
Author(s):  
Martina Pantaler ◽  
Christian Fettkenhauer ◽  
Hoang L. Nguyen ◽  
Irina Anusca ◽  
Doru C. Lupascu
Keyword(s):  
Thin Films ◽  
Spin Coating ◽  
Perovskite Phase ◽  
Perovskite Solar Cells ◽  
Double Perovskite ◽  
Double Perovskites ◽  
Sequential Deposition ◽  
Absorber Material ◽  
Photovoltaic Applications ◽  
Deposition Processes

ABSTRACTThe lead free double perovskite Cs2AgBiBr6 is an upcoming alternative to lead based perovskites as absorber material in perovskite solar cells. So far, the majority of investigations on this interesting material have focused on polycrystalline powders and single crystals. We present vapor and solution based approaches for the preparation of Cs2AgBiBr6 thin films. Sequential vapor deposition processes starting from different precursors are shown and their weaknesses are discussed. Single source evaporation of Cs2AgBiBr6 and sequential deposition of Cs3Bi2Br9 and AgBr result in the formation of the double perovskite phase. Additionally, we show the possibility of the preparation of planar Cs2AgBiBr6 thin films by spin coating.

scholarly journals Magnetizing lead-free halide double perovskites

2020 ◽  
Vol 6 (45) ◽  
pp. eabb5381
Author(s):  
Weihua Ning ◽  
Jinke Bao ◽  
Yuttapoom Puttisong ◽  
Fabrizo Moro ◽  
Libor Kobera ◽  
...  
Keyword(s):  
High Speed ◽  
Double Perovskite ◽  
Lead Free ◽  
Great Success ◽  
Double Perovskites ◽  
Temperature Dependent ◽  
Magnetic Elements ◽  
Halide Perovskites ◽  
New Generation ◽  
Further Development

Spintronics holds great potential for next-generation high-speed and low–power consumption information technology. Recently, lead halide perovskites (LHPs), which have gained great success in optoelectronics, also show interesting magnetic properties. However, the spin-related properties in LHPs originate from the spin-orbit coupling of Pb, limiting further development of these materials in spintronics. Here, we demonstrate a new generation of halide perovskites, by alloying magnetic elements into optoelectronic double perovskites, which provide rich chemical and structural diversities to host different magnetic elements. In our iron-alloyed double perovskite, Cs2Ag(Bi:Fe)Br6, Fe3+ replaces Bi3+ and forms FeBr6 clusters that homogenously distribute throughout the double perovskite crystals. We observe a strong temperature-dependent magnetic response at temperatures below 30 K, which is tentatively attributed to a weak ferromagnetic or antiferromagnetic response from localized regions. We anticipate that this work will stimulate future efforts in exploring this simple yet efficient approach to develop new spintronic materials based on lead-free double perovskites.

Double perovskite A2LaNbO6:Mn4+,Eu3+ (A = Ba, Ca) phosphors: potential applications in optical temperature sensing

2019 ◽  
Vol 48 (27) ◽  
pp. 10062-10069 ◽  
Author(s):  
Peng Wang ◽  
Jiashan Mao ◽  
Lu Zhao ◽  
Bin Jiang ◽  
Chunyan Xie ◽  
...  
Keyword(s):  
Double Perovskite ◽  
Temperature Sensing ◽  
Luminescence Properties ◽  
Potential Applications ◽  
Mn Doped

The study of the luminescence properties of Mn-doped double perovskite phosphors shows that they have potential applications in optical temperature sensing.

scholarly journals Nanocrystalline Antiferromagnetic High-κ Dielectric Sr2NiMO6 (M = Te, W) with Double Perovskite Structure Type

Molecules ◽  
2020 ◽  
Vol 25 (17) ◽  
pp. 3996
Author(s):  
Jelena Bijelić ◽  
Dalibor Tatar ◽  
Sugato Hajra ◽  
Manisha Sahu ◽  
Sang Jae Kim ◽  
...  
Keyword(s):  
Dielectric Loss ◽  
Sol Gel ◽  
Double Perovskite ◽  
Structure Type ◽  
Nyquist Plot ◽  
Dielectric Constants ◽  
Nanocrystalline Powders ◽  
Double Perovskites ◽  
Magnetic Studies ◽  
Magnetic Ground State

Double perovskites have been extensively studied in materials chemistry due to their excellent properties and novel features attributed to the coexistence of ferro/ferri/antiferro-magnetic ground state and semiconductor band gap within the same material. Double perovskites with Sr2NiMO6 (M = Te, W) structure type have been synthesized using simple, non-toxic and costless aqueous citrate sol-gel route. The reaction yielded phase-pure nanocrystalline powders of two compounds: Sr2NiWO6 (SNWO) and Sr2NiTeO6 (SNTO). According to the Rietveld refinement of powder X-ray diffraction data at room temperature, Sr2NiWO6 is tetragonal (I4/m) and Sr2NiTeO6 is monoclinic (C12/m1), with average crystallite sizes of 49 and 77 nm, respectively. Structural studies have been additionally performed by Raman spectroscopy revealing optical phonons typical for vibrations of Te6+/W6+O6 octahedra. Both SNTO and SNWO possess high values of dielectric constants (341 and 308, respectively) with low dielectric loss (0.06 for SNWO) at a frequency of 1 kHz. These values decrease exponentially with the increase of frequency to 1000 kHz, with the dielectric constant being around 260 for both compounds and dielectric loss being 0.01 for SNWO and 0.04 for SNTO. The Nyquist plot for both samples confirms the non-Debye type of relaxation behavior and the dominance of shorter-range movement of charge carriers. Magnetic studies of both compounds revealed antiferromagnetic behavior, with Néel temperature (TN) being 57 K for SNWO and 35 K for SNTO.

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