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光致变色材料作为一种自适应型智能材料, 在智能窗户、光电传感器、光学存储等领域均有广泛的应用. 稀土含氧氢化物(REHxOy)薄膜作为一种新型光致变色材料, 自发现以来, 就以其高效可逆的变色性能、简单可重复的制备方法、快速的着褪色时间受到了大量的关注. 本文基于近年来针对稀土含氧氢化物光致变色薄膜的结构组成、变色机理、性能调控的研究现状进行了综述. REHxOy薄膜可以响应紫外光和可见光的激发, 对全光谱波段透过率进行大幅调节. 光致变色机理可归类为晶格收缩机制、氧交换机制、局部金属相变、氢迁移机制4种解释. 目前可以通过控制薄膜形貌、设计化学组分、提高衬底适配、多层膜结构设计等方式进行性能调控. 最后对薄膜之后的研究重点进行了展望.Photochromic material, as an adaptive smart material, has a wide range of applications in smart windows, photoelectric sensors, optical storage, etc. Oxygen-containing rare-earth metal hydride (REHxOy) film, a new type of photochromic material, has attracted the attention of researchers for its efficient and reversible color-changing properties, simple and reproducible preparation methods, and fast darkening-bleaching time. In this paper we review the current research status of structural composition, color change mechanism, and property modulation of oxygen-containing rare-earth metal hydride films. Exposure to visible light and ultraviolet (UV) light can lead the optical transmission of visible and infrared (IR) light to degrade. The photochromic mechanisms can be grouped into four mechanisms: lattice contraction mechanism, oxygen exchange mechanism, local metal phase change, and hydrogen migration mechanism. Currently, performance can be tuned by controlling film morphology, designing chemical components, improving substrate adaptation, multilayer film structure design, etc. Finally, the future research focus of thin film is prospected.
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Keywords:
- photochromic materials /
- REHxOy thin film /
- structural composition /
- mechanism /
- property modulation
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图 3 氧浓度对薄膜带隙的影响 (a)梯度氧含量制备样品; (b)横向尺度上O/Y化学计量比; (c)横向尺度上带隙变化[24]
Fig. 3. Effect of oxygen concentration on the band gap of thin films: (a) Samples prepared with gradient oxygen content; (b) the O/Y stoichiometric ratio in the horizontal direction; (c) the band gap variation in the horizontal direction[24].
图 4 YHxOy薄膜光学性能和电学性能 (a)光照前后样品透过率、反射率和光学密度的变化[13]; (b) Tauc-plot法计算样品直接带隙与间接带隙[29]; (c)光照前后样品的电阻变化[28]
Fig. 4. Optical and electrical properties of YHxOy films: (a) The changes in transmission, reflection, and optical density of YHxOy films before and after light exposure[13]; (b) the direct and indirect bandgap of YHxOy films[29]; (c) the changes in resistivity of YHxOy films under light induction[28].
图 6 (a)同步X射线原位表征光照下样品晶格变化[37]; (b)光照之后拉曼光谱中出现金属相峰位[40]; (c)不同气氛下样品光照后的褪色速度[41]; (d)光致变色前后薄膜成分变化[32]
Fig. 6. (a) Simultaneous X-ray in situ characterization of sample lattice changes under illumination[37]; (b) appearance of metal phase peaks in Raman spectra after illumination[40]; (c) recovery rate of samples under different atmospheres after illumination[41]; (d) the change in film composition before and after photochromic[32].
图 9 (a)不同衬底样品的光致变色响应[52]; (b) 不同厚度样品的光致变色响应[47]; (c)不同稀土元素样品的光致变色响应[14]; 不同溅射压力样品(d) YHxOy薄膜和(e) GdHxOy薄膜的光致变色响应[15], 以及(f)光致变色性能与化学组分之间的关系[15]
Fig. 9. (a) Photochromic response of samples with different substrates[52]; (b) photochromic response of samples with different thicknesses[47]; (c) photochromic response of different rare earth element samples[14]. The photochromic response of different sputtering pressure samples: (d) YHxOy film; (e) GdHxOy film[15]; (f) relationship between photochromic properties and chemical components[15].
Type of the material Name of material Photochromism principle Method of bleaching Color change Organic Diarylethenes Photocyclization reaction Expose to visible light Colorless → red Fulgide Photochemical conrotatory Expose to visible light Pale yellow → red Spriopyran Hetetolytic cleavage/photocyclization Expose to visible light/heating Colorless → purple Naphthopyarn Hetetolytic cleavage/photocyclization Removing UV Colorless → gray Inorganic TMOs WO3 Photon prompted redox reaction Removing UV Colorless → blue TiO2 Photon prompted redox reaction Removing UV and
exposing to airFaint yellow → black MoO3 Intercalation-deintercalation of univalent cations Removing UV White → blue Metal halides Lead chloride [Pb3Cl6(CV)]H2O]n Light-triggered electron transfer Removing UV/
anneal in airPale yellow → blue AgCl Light-triggered reversible decomposition Removing UV Transparent → brown 表 2 已有报道稀土元素的性质
Table 2. Properties of reported rare earth element.
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[1] Ke Y, Chen J, Lin G, Wang S, Zhou Y, Yin J, Pooi S L, Long Y 2019 Adv. Energy Mater. 9 1902066
Google Scholar
[2] Ma Y, Yu Y, She P, Lu J, Liu S, Huang W, Zhao Q 2020 Sci. Adv. 6 2386
Google Scholar
[3] Barachevsky V A, Strokach Y P, Krayushkin M M 2007 J. Phys. Org. Chem. 20 1007
Google Scholar
[4] Qin M, Huang Y, Li F, Song Y 2015 J. Mater. Chem. C 3 9265
Google Scholar
[5] Gavrilyuk A I 2013 Appl. Surf. Sci. 273 735
Google Scholar
[6] Eglitis R, Zukuls A, Viter R 2020 Photochem. Photobiol. Sci. 19 1072
Google Scholar
[7] Zhu Y, Yao Y, Chen, Zhang Z, Zhang P, Cheng Z, Gao Y 2022 Sol. Energy Mater. Sol. Cells 239 111664
Google Scholar
[8] Tang W 2022 Chem. Eng. J. 435 134670
Google Scholar
[9] Huiberts J N, Griessen R, Rector J H, Wijngaarden R J, Dekker J P 1996 Nature 380 231
Google Scholar
[10] Hoekstra A F T, Roy A S, Rosenbaum T F, Griessen R 2001 Phys. Rev. Lett. 86 5349
Google Scholar
[11] Ngene P, Longo A, Moojj L 2017 Nat. Commun. 8 1846
Google Scholar
[12] Ohumura A, Machida A, Watanuki T 2007 Appl. Phys. Lett. 91 151904
Google Scholar
[13] Mongstad T, Platzer-Bjorkman C, Maehlen J, Lennard P A M, Yevheniy P, Dam B, Marstein E, Karazhanov S Z 2011 Sol. Energy Mater. Sol. Cells 95 3596
Google Scholar
[14] Nafezarefi F, Schreuders H, Dam B 2017 Appl. Phys. Lett. 111 103903
Google Scholar
[15] Colombi G, Dekrom T, Chaykina D 2021 ACS Photonics 8 709
Google Scholar
[16] Baba E M, Montero J, Moldarev D, Moro M V, Wolff M, Primetzhofer D, Sartori S, Zayim E, Karazhanov S Z 2020 Molecules 25 3181
Google Scholar
[17] Moldarev D, Moro M V, You C C, Elbruz M B, Karazhanov S Z 2018 Phys. Rev. Mater. 2 115203
Google Scholar
[18] Chai J, Shao Z, Wang H, Ming C, Oh W, Ye T, Zhang Y, Cao X, Ping Jin, Sun Y 2020 Sci. China Mater. 63 1579
Google Scholar
[19] Colombi G, Cornelius S, Longo A 2020 J. Phys. Chem. C 124 13541
Google Scholar
[20] Pishtshev A, Strougovshchikov E, Karazhanov S 2019 Cryst. Growth Des. 19 2574
Google Scholar
[21] Chaykin D, Nafezarefi F, Colombi G, Cornelius S, Lars J 2022 J. Phys. Chem. C 126 2276
Google Scholar
[22] Montero J, Martinsen F A, Lelis M, Karazhanov S Z, Hauback B C, Marstein E S 2018 Sol. Energy Mater. Sol. Cells 177 106
[23] Pishtshev A, Karazhanov S Z 2014 Solid State Commun. 194 39
Google Scholar
[24] You C C, Moldarev D, Mongstada T, Primetzhofer D, Wolffb M, Marsteina E S, Karazhanov S Z 2017 Sol. Energy Mater. Sol. Cells. 166 185
Google Scholar
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Google Scholar
[26] Kantre K, Moro M V, Moldarev D 2020 Scr. Mater. 186 352
Google Scholar
[27] Mongstad T, Subrahmanyam A, Karazhanov S 2014 Sol. Energy Mater. Sol. Cells 128 270
Google Scholar
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Google Scholar
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Google Scholar
[30] You C C, Karazhanov S Z 2020 J. Appl. Phys. 128 013106
Google Scholar
[31] Shao Z, Cao X, Zhang Q, Long S, Chang T, Xu F, Jin P. 2019 Sol. Energy Mater. Sol. Cells 200 110044
Google Scholar
[32] Moro M V 2019 Sol. Energy Mater. Sol. Cells 201 110119
Google Scholar
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Google Scholar
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[35] Dam B, Remhof A, Heijna M C R, Rector J H, Borsa D, Kerssemakers J W J 2003 J. Alloys Compd. 356–357 526
Google Scholar
[36] 田民波, 李正操 2011 薄膜技术与薄膜材料 (北京: 清华大学出版社) 第251页
Tian M B, Li Z C 2011 Thin Film Technology and Thin-Film Materials (Beijing: Tsinghua University Press) p251 (in Chinese)
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
[45] Chandran C V, Schreuders H, Dam B, Janssen J W G, Bart J, Kentgens A P M 2014 J. Phys. Chem. C 118 22935
Google Scholar
[46] Nafezarefi F, Cornelius S, Dam B 2019 Sol. Energy Mater. Sol. Cells 200 109923
Google Scholar
[47] Moldarev D, Wolff M, Baba E M, Moro M V, You C C, Primetzhofer D, Karazhanov S Z 2020 Materialia 11 100706
Google Scholar
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Google Scholar
[49] 陈赟斐, 魏峰, 王赫, 赵未昀, 邓元 2021 70 207303
Google Scholar
Chen Y F, Wei F, Wang H, Zhao W H, Deng Y 2021 Acta Phys. Sin. 70 207303
Google Scholar
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Google Scholar
[51] 白刚, 韩宇航, 高存法 2022 71 097701
Google Scholar
Bai G, Han Y H, Gao C F 2022 Acta Phys. Sin. 71 097701
Google Scholar
[52] You C C, Mongstad T, Maehlen J P 2015 Sol. Energy Mater. Sol. Cells 143 623
Google Scholar
[53] You C C, Mongstad T, Maehlen J P, Karazhanov S 2014 Appl. Phys. Lett. 105 031910
Google Scholar
[54] Moldarev D, Primetzhofer D, You C C, Karazhanov S Z, Montero J, Martinsen F, Mongstad T, Marstein E S, Wolff M 2018 Sol. Energy Mater. Sol. Cells 177 66
Google Scholar
[55] Strugovshchikov E, Pishtshev A, Karazhanov S 2021 Phys. Status Solidi B 258 2100179
Google Scholar
[56] 拉毛, 包山虎, 莎仁 2018 化学学报 77 90
Google Scholar
La M, Bao S H, Sha R 2018 Acta Chim. Sin. 77 90
Google Scholar
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