Spin Centers in Vanadium-Doped Cs2NaInCl6 Halide Double Perovskites DOI Creative Commons
Kunpot Mopoung, Anna Dávid, Xianjie Liu

et al.

ACS Materials Letters, Journal Year: 2024, Volume and Issue: 6(2), P. 566 - 571

Published: Jan. 9, 2024

We provide direct evidence for a spin-active V4+ defect center, likely in the form of VO2+ complex, predominantly introduced single crystals vanadium-doped Cs2NaInCl6 halide double perovskites grown by solution-processed hydrothermal method. The has C4v point group symmetry, exhibiting an electron paramagnetic resonance (EPR) spectrum arising from effective spin S = 1/2 and nuclear I 7/2 (corresponding to 51V with nearly 100% natural abundance). determined g-factor hyperfine parameter values are g⊥= 1.973, g∥ 1.945, A⊥ 180 MHz, A∥ 504 principal axis z along ⟨001⟩ crystallographic axis. controlled growth V-doped oxygen-free environment is shown suppress EPR signal. model suggested have VOCl5 octahedral coordination, where one nearest-neighbor Cl– V replaced O2–, compression V–O This VO complex formation competes isolated V3+ substitution In3+, which turn provides means charge-state tuning ions. finding calls better understanding control solution-grown perovskites, critical optimizing tailoring material design solution-processable optoelectronics spintronics.

Language: Английский

Halide Double Perovskite Nanocrystals Doped with Rare‐Earth Ions for Multifunctional Applications DOI Creative Commons
Xin Li, Dingdi Wang, Yuan Zhong

et al.

Advanced Science, Journal Year: 2023, Volume and Issue: 10(20)

Published: April 28, 2023

Most lead-free halide double perovskite materials display low photoluminescence quantum yield (PLQY) due to the indirect bandgap or forbidden transition. Doping is an effective strategy tailor optical properties of materials. Herein, efficient blue-emitting Sb3+ -doped Cs2 NaInCl6 nanocrystals (NCs) are selected as host, rare-earth (RE) ions (Sm3+ , Eu3+ Tb3+ and Dy3+ ) incorporated into excellent PLQY 80.1% obtained. Femtosecond transient absorption measurement found that RE not only served activator but also filled deep vacancy defects. Anti-counterfeiting, thermometry, white-light-emitting diodes (WLEDs) exhibited using these ions-doped NCs. For thermometry based on Sm3+ :Sb3+ NCs, maximum relative sensitivity 0.753% K-1 which higher than those most temperature-sensing Moreover, WLED fabricated by NCs@PMMA displays CIE color coordinates (0.30, 0.28), a luminous efficiency 37.5 lm W-1 CCT 8035 K, CRI over 80, indicate NCs promising single-component phosphors for next-generation lighting technologies.

Language: Английский

Citations

91
Advanced Optical Information Encryption Enabled by Polychromatic and Stimuli‐Responsive Luminescence of Sb‐Doped Double Perovskites DOI Creative Commons

Yijun Zhao,

Xingru Yang,

Lun Yang

et al.

Advanced Science, Journal Year: 2024, Volume and Issue: 11(24)

Published: April 16, 2024

Abstract The smart materials with multi‐color and stimuli‐responsive luminescence are very promising for next generation of optical information encryption anti‐counterfeiting, but these still scarce. Herein, a multi‐level strategy is developed based on the polychromatic emission Sb‐doped double perovskite powders (SDPPs). Cs 2 NaInCl 6 :Sb, KInCl AgInCl :Sb synthesized through coprecipitation methods exhibit broadband emissions bright blue, cyan, orange colors, respectively. transmitted by specific SDPP encrypted when different SDPPs mixed. confidential can be decrypted selecting corresponding narrowband filter. Then, an quick response (QR) code improved security demonstrated this multi‐channel selection strategy. Moreover, three types water‐triggered switching behaviors. represented erased/recovered simple water spray/drying. Whereas, collected from green channel permanently erased moisture, which fundamentally avoids leakage. Therefore, schemes designed to meet variety requirements. multicolor greatly enrich flexibility encryption, leaps level confidentiality.

Language: Английский

Citations

29
Beyond lead halide perovskites: Crystal structure, bandgaps, photovoltaic properties and future stance of lead-free halide double perovskites DOI
Venkatramanan Kumar, Arunkumar Kathiravan, Mariadoss Asha Jhonsi

et al.

Nano Energy, Journal Year: 2024, Volume and Issue: 125, P. 109523 - 109523

Published: March 22, 2024

Language: Английский

Citations

27
Multiple optical thermometry and dynamic anti-counterfeiting based on multicolor luminescence of SrY2O4:Bi3+,Er3+ phosphor DOI

Qingqing Yu,

Fumin Lu,

Ligan Ma

et al.

Ceramics International, Journal Year: 2024, Volume and Issue: 50(9), P. 15417 - 15425

Published: Feb. 2, 2024

Language: Английский

Citations

17
Erbium‐Induced Boost in Self‐Trapped Exciton Emission of Double Perovskites for Highly Sensitive Multimodal and Multiplexed Optical Thermography DOI
Gaoqiang Li, Shanshan Cheng, Xu Chen

et al.

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: April 16, 2024

Abstract Self‐trapped excitons (STEs) of lead‐free perovskites have aroused tremendous interest in remote optical thermometry due to strong exciton–phonon coupling and large Stokes shifts. Herein, a bright multimodal multiplexed thermometer is constructed with high sensitivity ( S r ) self‐calibrating ability based on Cs 2 NaInCl 6 :Er 3+ double perovskite, allowing for fast simplified reading via mobile devices. Intriguingly, Er doping not only shows the characteristic green emissions but also introduces nanoelectronic domains through new localized valance band maximum breaks symmetry In site, which facilitates generation more STEs. The temperature‐sensitive blue emission STEs temperature‐insensitive endow including time‐resolved ratiometric readout schemes 3.8% K −1 , where an upconversion primary serves as reference calibrate other modes. Meanwhile, designed thermometers show robust photostability, repeatability, structural stability long‐time working storage. addition, remarkable thermochromic phenomenon from enables quick color‐multiplexed thermography smartphone, utilized capture real‐time 2D thermal imaging microelectronic This work demonstrates great potential perovskite low‐cost portable thermometry.

Language: Английский

Citations

17
A Luminescent Hybrid Bimetallic Halide Family with Solvent‐Coordinated Rare Earth and Alkaline Earth Metals DOI
Jiawei Lin, Pan Wang,

Jiaqian Zhou

et al.

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(29)

Published: May 6, 2024

Abstract Hybrid metal halides are an extraordinary class of optoelectronic materials with extensive applications. To further diversify and study the in‐depth structure‐property relations, we report here a new family 21 zero‐dimensional hybrid bimetallic chlorides general formula A ( L ) n [ B Cl m ] =rare earth RE ), alkaline metals Mn; =solvent ligand; =Sb, Bi Te). The (DMSO) 8 6 =La, Ce, Sm, Eu, Tb, Dy; DMSO=dimethyl sulfoxide) series shows broadband emission attributed to triplet radiative recombination from Sb Bi, incorporating characteristic metals, where Eu(DMSO) [BiCl staggering PL quantum yield 94 %. pseudo‐octahedral [SbCl 5 vacancy in II =Mg, Ca Mn) square pyramidal (TMSO) (TMSO=tetramethylene enhance stereoactive expression s 2 lone pairs 3+ , giving rise observation dual‐band singlet emission, respectively. Te(IV) analogues have been characterized, showing blue‐light‐excitable single‐band emission. This work expands space for emphasis on harnessing elements, provides important insights into designing emitters regulating their properties.

Language: Английский

Citations

13
Temperature-Dependent Photoluminescence from Well-Resolved Excited State Structures in Rare-Earth-Based Double Perovskites DOI
Haowen Hou, Shuai Zhang, Haiyan Wang

et al.

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(24), P. 31332 - 31340

Published: June 4, 2024

Lead-free halide double perovskites (DPs) have become a research hotspot in the field of photoelectrons due to their unique optical properties and flexible compositional tuning. However, reports on DPs primarily concentrate room temperature state only exhibit single emission band. Here, we synthesized Cs2NaYCl6:Sb3+, Dy3+ by solvothermal method realize white light with photoluminescence (PL) quantum yield as high 70.7%. The energy-transfer process from self-trapped excitons (STEs) ions was revealed characterization theoretical simulation calculations. Interestingly, observed double-emission low-energy STE Sb3+ at low temperatures, is consistent asymmetric doublet feature 3P1 → 1S0 transition split into two minima. PL spectra further showed that fluorescence intensity ratios 580 680 nm were strongly temperature-dependent, relative sensitivity up 1.79% K–1 360 K. Moreover, near-infrared radiation luminescence indicated also good prospects for night vision detection, well great potential applications solid-state illumination measurement.

Language: Английский

Citations

13
A Single‐Component Sb/Ho: Cs2Na0.9Ag0.1(In/Bi)Cl6 White Phosphor with a Record Color Rendering Index of 97.4 DOI

Manjia Zhang,

Shilin Jin,

Tao Pang

et al.

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(45)

Published: Aug. 8, 2024

Abstract The study on phosphors‐converted white light‐emitting diodes (pc‐WLEDs) using lead‐free double perovskites (DPs) as single‐component phosphors is widely concerned. However, the photoluminescence quantum yields (PLQY) of luminescence and color rendering index (CRI) WLED are not satisfactory. Herein, a new Sb/Ho: Cs 2 Na 0.9 Ag 0.1 (In/Bi)Cl 6 phosphor with highest PLQY 93% record CRI 97.4 reported. Experimental data theoretical calculations evidence that in addition to broadband yellow emission self‐trapped exciton (STE) recombination, material also exhibits blue from Sb 3+ : 3 P 1 → S 0 transition red one assigned Ho 5 F I 8 transition. Steady‐state time‐resolved PL spectra verify existence two energy transfer channels both STE dopants. As demo, (In/Bi) Cl6‐based constructed, showing excellent comprehensive optical performance specially improved saturation R9 R12. This work provides novel rare‐earth doped DP for high full‐spectrum solid‐state lighting.

Language: Английский

Citations

13
Efficient near‐infrared emission in lanthanum ion doped double perovskite Cs2NaScCl6 via Cr3+ sensitization under visible light excitation DOI Creative Commons

Weiguo Huang,

Hui Peng,

Jinling Huang

et al.

EcoMat, Journal Year: 2024, Volume and Issue: 6(3)

Published: Jan. 25, 2024

Abstract Herein, we synthesized Cr 3+ /Ln (Er , Tm )‐codoped rare earth‐based Cs 2 NaScCl 6 double perovskite, and the near‐infrared emission of Ln can be excited by visible light through energy transfer (ET) from to . Moreover, there are two independent bands, which stems 4 T → A transition (970 nm) f‐f (1542 nm for Er 1220 ), respectively. Particularly, both compounds have ultra‐high photoluminescence quantum yield (PLQY) 60% 10%Cr /6%Er ‐codoped emission: ∼26%) 68% /4.5%Tm (Tm ∼56%), attributed ET efficiency similar ionic activity Sc allowing more dopants enter host lattice. Considering excellent stability samples, demonstrated /Tm in applications imaging night vision. Finally, reported /9%Er ‐tridoped further applied it optical thermometry. image

Language: Английский

Citations

12
Enhanced Efficiency, Broadened Excitation, and Tailored Er3+ Luminescence Triggered by Te4+ Codoping in Cs2NaYbCl6 Crystals for Multifunctional Applications DOI
Xi Chen, Yuexiao Pan, Yi‐hong Ding

et al.

Inorganic Chemistry, Journal Year: 2024, Volume and Issue: 63(7), P. 3525 - 3534

Published: Feb. 7, 2024

The quest for efficient and tunable luminescent materials has been at the forefront of research in fields chemistry science. This work delves into investigation luminescence properties Er3+ ions triggered by 1% Te4+ environmentally benign perovskite Cs2NaYbCl6 (CNYC) crystals, aiming to enhance their efficiency tune color. ratio green (2H11/2, 4S3/2–4I15/2) red (4F9/2–4I15/2) emissions can be freely varying concentration producing defects induced codoping Te4+. calculations reveal that multiexcitonic excitations stem from f–f (4I15/2–4G11/2, 2H9/2) rather than d–f transitions. broadened excitation, tuning color, enhancement achieved crystals Cs2NaYbCl6:Te4+, (CNYC:Te4+,Er3+) presents promising opportunities development advanced optoelectronic devices with superior performance. Moreover, our demonstrates response CNYC:Er3+ temperature variations, offering potential applications sensing.

Language: Английский

Citations

10