JOURNAL OF SOLID STATE CHEMISTRY
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2023
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IF 3.3
Jian-Peng Qin,Chun-Yang Pan
The toxicity of lead limits the commercial application of lead-based perovskites . Replacing lead with an environment-friendly metal is an excellent alternative strategy. Bi 3+ is an interesting choice being that it has satisfactory biological security and similar electron configuration to Pb 2+ . Series of hybrid Bi 3+ perovskites, (H 2 DMAPA)BiBr 5 ( 1 ), (H 2 DMAPA)BiBr 2 I 3 ( 2 ), (H 2 DMAPA) 2 AgBiBr 8 ( 3 ) and (H 2 EP) 2 AgBiBr 8 ( 4 ) were successfully prepared in this work. Their band gaps are 2.65, 2.21, 2.58 and 2.33 eV, respectively. The excitation wavelengths of 1 , 2 , 3 and 4 are 440, 355, 365 and 400 nm, and the corresponding PL emission peaks are located at 480, 580, 493 and 467 nm, respectively.
研究领域:
材料科学
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光电
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化学
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DOI
高影响因子
Materials
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2016
·Vol. 9
·期 9
·779
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IF 2.728
Yingfei Hou,Lingqian Kong,Xiuping Ju,Xiaoli Liu,Jinsheng Zhao,Qingshan Niu
Two novel triphenylamine-based thiophene derivative monomers, 4-cyano-4′,4″-di(4-methoxythiophen-2-yl)triphenylamine and 4-methoxy-4′,4″-di(4-methoxythiophen-2-yl)triphenylamine, were successfully synthesized. The corresponding polymers including poly (4-cyano-4′,4″-di(4-methoxythiophen-2-yl)triphenylamine) and poly (4-methoxy-4′,4″-di(4-methoxythiophen-2-yl)triphenylamine) were electrochemically synthesized and characterized by multiple test method. The electrochemical measurements and spectroelectrochemical analyses revealed that both of the two polymers had quasi-reversible redox behavior and multi-electrochromic properties. The two polymer films showed reversible electrochemical oxidation, excellent optical contrasts in NIR region (62% at 1070 nm for the first polymer, and 86% at 1255 nm for the second polymer), satisfactory coloration efficiencies and fast switching times. The research on the application of the as prepared polymer in the fabrication of electrochromic device was also conducted, employing PCMTPA or PMMTPA as the anodically coloring materials.Keywords:4-cyanotriphenylamine;4-methoxytriphenylamine;bithiophenes derivatives;electrochromism;spectroelectrochemistry;electrochromic devices
研究领域:
材料科学
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电化学
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高分子化学
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光电技术
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Jialiang Jiang,Jinju Zheng,Hui Fu,Hao Zhang,Deliu Ou,Qiaochu Chen,Kai Wang,Sheng Cao,Jialong Zhao,Zhentao Du,Weiyou Yang
Vacancy-ordered double perovskites (DPs) are promising candidates for modern white light-emitting-diodes (WLEDs) due to their low toxicity and unique optical properties. However, the grand challenge is that DPs synthesized at room temperature (RT) typically have a low photoluminescence quantum yield (PLQY), most of which reported below 51 %, making them impractical for applications. Here, we present a facile strategy for the mass production of Bi 3+ and Te 4+ co-doped Cs 2 HfCl 6 (CHC) DPs at RT, to realize single-component dual-band emission with a high color rendering index. It is witnessed that the rationally designed ligand [Hmim]Cl facilitates a strong chemical interaction between the ligand and DPs. This interaction allows [Hmim]Cl to coordinate with undercoordinated Hf 4+ ions and provide excess chloride ions to the surface of the DPs. Consequently, it effectively controls the crystallization of DPs, protects them against moisture, reduces surface defects, and increases the migration barrier of halogen ions. As a result, the DPs exhibit excellent overall performance with robust photostability and a superior PLQY of 96.4 %, which is ∼ 2 times the highest reported value for similar DPs synthesized at RT. Current work presents a potential pathway for the mass production of high-quality DPs under mild conditions, leading to the development of signal-component WLEDs.
研究领域:
材料科学
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光电技术
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纳米技术
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2020
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IF 16.683
Fang Li,Geun Ho Gu,Changhyeok Choi,Praveen Kolla,Song Hong,Tai-Sing Wu,Yun-Liang Soo,Justus Masa,Sanjeev Mukerjee,Yousung Jung,Jieshan Qiu,Zhenyu Sun
We report a unique 2D bismuth metal-organic framework (Bi-MOF) that possesses permanent accessible porosity for efficient electrochemical CO 2 reduction (ECR) to HCOOH. The 2D open-framework structure with helical Bi-O rods bridged by tritopic carboxylate ligands exhibits a remarkable Faradaic efficiency for HCOOH formation over a broad potential window, reaching 92.2 % at ∼ –0.9 V ( vs . reversible hydrogen electrode, RHE) with excellent durability over 30 h. The mass-specific HCOOH partial current density is up to 41.0 mA mg Bi −1 , exceeding 4 times higher than that of commercial Bi 2 O 3 and Bi sheets at ∼ –1.1 V ( vs . RHE). Operando and ex-situ X-ray absorption fine structure spectroscopy revealed a structural feature associated with Bi-MOF to preserve Bi(3+) during and after long-term ECR. Theoretical calculations further showed that the crystallographically channels with abundant Bi active sites in the MOF structure favor the formation of *HCOO while suppressing the side-reaction of hydrogen evolution, thereby leading to the high selectivity for HCOOH.
研究领域:
材料科学
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电化学
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环境科学
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DOI
高影响因子
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