Highly responsive photochromic behavior with large coloration contrast in Ba/Sm co-doped (K0.5Na0.5)NbO3 transparent ceramics

Yu, Fangyuan; Chi, Yuan; Wang, Peng; Ma, Bowen; Wu, Xiao; Lin, Cong; Zhao, Chunlin; Gao, Min; Lin, Tengfei; Zhang, Qiwei

doi:10.1016/j.ceramint.2022.03.169

Cited by 28 publications

(28 citation statements)

References 41 publications

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“…The observed T increases rapidly from zero at the front-cut-off wavelength (∼390 nm), which is attributed to the inter-band transition corresponding to UV absorption edge. 22 25,26 Except for these absorption peaks caused by Sm doping, the optical transmittance slowly increases close to the theoretical limit (T th ) (see Figure 3B) in the near-infrared region. The T th value can be obtained following the equation…”

Section: Resultssupporting

confidence: 68%

“…The observed T increases rapidly from zero at the front‐cut‐off wavelength (∼390 nm), which is attributed to the inter‐band transition corresponding to UV absorption edge 22 . In each spectrum, several absorption peaks appear centered at 462, 1098, 1254, 1396, and 1511 nm, resulting from the transitions of 6 H 5/2 → 6 F 7/2 , 6 H 5/2 → 6 F 9/2 , 6 H 5/2 → 6 F 7/2 , 6 H 5/2 → 6 F 5/2 , and 6 H 5/2 → 6 F 3/2 of Sm 3+ , respectively 25,26 . Except for these absorption peaks caused by Sm doping, the optical transmittance slowly increases close to the theoretical limit ( T th ) (see Figure 3B) in the near‐infrared region.…”

Section: Resultsmentioning

confidence: 95%

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Evaluation of pore scattering in transparent ceramics: A simplified model for nanometric spherical pores

et al. 2022

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It is well known that light scattering by nanometric pores is adverse to realize a high transparency in ceramics; however, a suitable model that gives this phenomenon a quantitative evaluation is still lacking. In this work, a simplified model based on Rayleigh's theory was developed in order to unravel the light scattering by nanometric pores, taking polycrystalline KNNB‐xSm ceramics with high transparency (>67% at 780 nm) as example. The validity of this model was further verified by its good agreement with experimental results. Based on detailed simulations, we came to the conclusion that the pore volume fraction p is a more important parameter on the transparency of KNNB‐xSm ceramics than pore size dpore. Our findings in this work might provide inspiring insight to obtain highly transparent KNN‐based ceramics and more.

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Section: Resultssupporting

confidence: 68%

Section: Resultsmentioning

confidence: 95%

Evaluation of pore scattering in transparent ceramics: A simplified model for nanometric spherical pores

et al. 2022

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“…For the B4-1180 ceramic, the proportion of the T phase is the highest, and the c/a value is closest to 1 (i.e., ∼1.0015). The crystal structure with high symmetry provides the prerequisite for highly transparent ceramics …”

Section: Resultsmentioning

confidence: 99%

“…Besides reversibility and stability, response time and coloration contrast are considered as two other key parameters for PC materials and devices. − Short response times endow PC materials with the capability of real-time information recording, while large coloration contrast is imperative for ultrasensitive devices. At present, many high-performance inorganic PC ceramics or films have been researched. − For example, BaMgSiO 4 : M (M = Ce 3+ , Mn 2+ or Nd 3+ ) ceramics exhibit up to 96.3% PL intensity modulation caused by photochromism . However, the optical information recorded on opaque ceramics or films is two-dimensional (2D) PC storage.…”

Section: Introductionmentioning

confidence: 99%

How to Realize Ultrahigh Photochromic Performance for Real-Time Optical Recording in Transparent Ceramics

Xiong

et al. 2023

ACS Appl. Mater. Interfaces

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A combination of transparency and photochromic (PC) properties in ferroelectrics has promising application potential in smart windows and optical storage/imaging. Nonetheless, limited by understanding the underlying PC mechanism, a splendid PC performance is rarely achieved in transparent ferroelectrics. Here, a strategy to construct deep-lying traps by ion-doping induced defect engineering in (K 0.5 Na 0.5 )-NbO 3 -based ferroelectric ceramics is proposed. Based on the improved density functional theory simulations, a high concentration of vacancy defects can be realized by codoping 1 mol % Pr and 4 mol % Ba in (K 0.5 Na 0.5 )NbO 3 , which helps achieving deep-lying traps and then superior PC performance. Through traditional pressureless sintering, highly transparent ceramics with designed optimal composition have been fabricated in a wide sintering temperature range (1170−1210 °C), exhibiting an ultrafast PC feature, i.e., 0.1 s response time (by illumination of 400 nm light), along with high PC efficiency (5.8 cm 2 • W −1 ) and PC rate (7.1 s −1 ), preeminent among reported inorganic PC transparent materials. Additionally, the ceramics have been utilized for real-time optical recording, displaying unambiguous patterning with long-time preservation (21 days). This research supplies a paradigm for designing high-performance PC transparent materials in optical applications and helps deepen the comprehensive understanding of the PC mechanism.

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“…(b) Energy band gap ( E g ) of ceramics. (c) Comparison of transparent properties of KNN-based photoluminescent ceramics with the thickness of 0.3–0.4 mm. − ,− (d) Photograph of the KNNLB- x %Tb transparent ceramics.…”

Section: Resultsmentioning

confidence: 99%

Photochromic and Electric Field-Regulating Luminescence in High-Transparent (K,Na)NbO₃-Based Ferroelectric Ceramics with Two-Phase Coexistence

Yang

Zhao

et al. 2022

ACS Appl. Mater. Interfaces

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Rare earth Tb3+ doped (K0.465Na0.465Li0.07)(Nb0.93Bi0.07)O3 (KNNLB-x%Tb) lead-free transparent ferroelectric ceramics were designed and prepared. The effects of Tb3+ on phase structure, microstructure, optical transmittance, photoluminescence, and photochromic behaviors were studied. Although two ferroelectric phases coexist, the optical transmittance can reach the high value of 74% in the visible light region because of the fine grains, dense ceramic microstructure, large optical energy band gap, and relatively high symmetry of coexisting ferroelectric phases. In addition, Tb3+ works as a luminescent center, and the reversible photochromic modulation is achieved by alternate stimulation of illumination and heat treatment. Meanwhile, the luminescence contrast can be improved under in situ electric field stimulation due to the easy change of lattice symmetry in coexisting ferroelectric phases. The generation of color centers after illumination and the local crystal field around the luminescent center caused by in situ electric field contributes to above phenomena. These ceramics exhibit the great potential in optical data storage and anticounterfeiting.

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Highly responsive photochromic behavior with large coloration contrast in Ba/Sm co-doped (K0.5Na0.5)NbO3 transparent ceramics

Cited by 28 publications

References 41 publications

Evaluation of pore scattering in transparent ceramics: A simplified model for nanometric spherical pores

Evaluation of pore scattering in transparent ceramics: A simplified model for nanometric spherical pores

How to Realize Ultrahigh Photochromic Performance for Real-Time Optical Recording in Transparent Ceramics

Photochromic and Electric Field-Regulating Luminescence in High-Transparent (K,Na)NbO₃-Based Ferroelectric Ceramics with Two-Phase Coexistence

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Highly responsive photochromic behavior with large coloration contrast in Ba/Sm co-doped (K0.5Na0.5)NbO3 transparent ceramics

Cited by 28 publications

References 41 publications

Evaluation of pore scattering in transparent ceramics: A simplified model for nanometric spherical pores

Evaluation of pore scattering in transparent ceramics: A simplified model for nanometric spherical pores

How to Realize Ultrahigh Photochromic Performance for Real-Time Optical Recording in Transparent Ceramics

Photochromic and Electric Field-Regulating Luminescence in High-Transparent (K,Na)NbO3-Based Ferroelectric Ceramics with Two-Phase Coexistence

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Photochromic and Electric Field-Regulating Luminescence in High-Transparent (K,Na)NbO₃-Based Ferroelectric Ceramics with Two-Phase Coexistence