Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 18
·6220-6226
·
IF 6.4
Dayu Huang,Ziyong Cheng,Qiuyun Ouyang,Hongzhou Lian,Jun Lin
The lattice defects that occur in material preparation processes are closely related to carrier migration. The carrier migration can be regulated by artificially modulating the defects to improve the luminescence performance, which is important for the development and application of luminescent materials. Here, we achieved a 3.29-fold increase in the high-temperature luminescence intensity by introducing Mn2+ to generate Cl vacancy defects in Cs2CdCl4. Due to thermally induced electron de-trapping, Cs2CdCl4:Mn2+ also displays anti-thermal quenching (ATQ) behavior and good thermal quenching resistance (329% at 175 °C). The increase in the photoionization effect and de-trapping of the captured electrons from shallow trap states were appropriately attributed to this exceptional phenomenon, based on thermoluminescence (TL) analysis. Based on comprehensive optical characterization, thermoluminescence and temperature-dependent X-ray diffraction (XRD), we reveal that the Cl vacancy trap state generated by Mn doping is the reason for the enhanced PL in air. The discovery of these materials helps to better understand the optical properties of all-inorganic perovskites.
研究领域:
材料科学
·
光学
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DOI
高影响因子
Journal of Physical Chemistry Letters
·
2025
·
IF 4.6
Qilin Wei,Tongtong Kou,Tong Chang,Liang Wang,Xinxin Han,William W. Yu
Ruddlesden−Popper phases Cs2CdCl4 and Cs3Cd2Cl7 are widely used in experimental research of optoelectronics due to their excellent doping matrix properties, but their optoelectronic mechanisms have not been fully explored. This study uses first-principles calculations and experiments to analyze the differences in point defect crystal growth and optoelectronic properties caused by Sb doping of these two materials. Sb tends to replace the position of Cd in both structures. Additional doping energy levels are introduced in the Sb doping of Cs2CdCl4, and the flat band edge increases the local charge density and improves the electron-hole recombination efficiency. The photoluminescence quantum yield (PLQY) of 0.1% Sb:Cs2CdCl4 doping is as high as 79.09%. Molecular dynamics simulations show that the octahedral distortion of [SbCl6]3– in Cs2CdCl4 is highly sensitive to temperature, and the Jahn–Teller distortion causes the formation of self-trapped excitons, which is more conducive to the generation of exciton recombination luminescence. In contrast, Sb doping of Cs3Cd2Cl7 produces a lower PLQY, which can be explained by the more delocalized charge distribution at its band edges and the lower octahedral structural distortion. Sb:Cs2CdCl4 exhibits high-performance X-ray imaging capabilities. This work provides valuable insights and guidance for optimizing Sb-doped Cd-based optoelectronic materials.
研究领域:
光电材料
·
材料科学
·
凝聚态物理
·
计算材料学
·
X射线成像技术
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DOI
PubMed
高影响因子
Advanced Optical Materials
·
2024
·
IF 8
Chao Wang,Zhengguang Yan,Lin Ma,Jiawen Xiao
Advanced optical information encryption usually relies on the integration of multicolor, stimulus-responsive, and afterglow luminescence. However, achieving these simultaneously within a single-phase system has posed challenges, complicating the design process. In this study, an advanced 3D information encryption strategy is presented based on undoped and alloyed Cs₂CdCl₄, encrypted through three distinct channels: emission wavelength, water stimulation, and afterglow time. Specifically, Mn 2+ , Sb 3+ , and Ag + doped Cs₂CdCl₄ single crystals are successfully synthesized via a modified hydrothermal method, which exhibit bright orange, green, and blue emissions, respectively. Decryption of specific information can be achieved by employing corresponding narrowband filters. Furthermore, the Cs₂CdCl₄ system demonstrates hydrochromism, attributed to water-induced sequential phase transitions. Upon water treatment, the 2D Cs₂CdCl₄ will undergo a phase transition to Cs 3 Cd 2 Cl 7 , and finally to cubic CsCdCl 3 . Interestingly, the resultant CsCdCl 3 exhibits pronounced afterglow, originating from the triplet emission of Cd ions. Leveraging these unique properties, a highly secure and adjustable 3D encrypted quick response code is designed. The encrypted information is encoded in coordinates, and decrypted information can be retrieved in both compressed and decompressed modes as required. These findings pave the way for the development of novel smart photonic materials and multimodal optical information encryption.
研究领域:
材料科学
·
光学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Yanrong Zhu,Hanlin Hu,Haizhe Zhong,Yumeng Shi
Conventional white light-emitting diodes often suffer from low color rendering index and high correlated color temperature due to the lack of red emission. Here, we report novel rare-earth-free Cs 2 CdCl 4 : Sb 3+ , Mn 2+ phosphors synthesized via a cost-effective co-precipitation route. The dual-emission behavior arises from Sb 3+ -related self-trapped excitons (green) and the characteristic 4 T 1 (G)→ 6 A 1 (S) transition of Mn 2+ (orange). Spectroscopic and time-resolved studies reveal an efficient Sb 3+ →Mn 2+ energy transfer process, governed by a dipole-quadrupole interaction. By adjusting Mn 2+ concentration, tunable emission spanning green to orange is achieved, enabling single-component white light generation. In addition, the strong concentration and excitation-dependent emission characteristics suggest potential applications in areas such as multidimensional information encryption and optical anti-counterfeiting. This work provides a low-cost, rare-earth-free strategy for designing multifunctional phosphors for high-quality lighting and security technologies.
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高影响因子
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