OPTICAL MATERIALS
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2022
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IF 3.754
Wentong Gao,Wenlu Wu,Shihai Cao,Bing Han,Nengquan Li
Solution-processable host materials play an important role in achieving highly efficient and cost-effective phosphorescent organic light-emitting diodes (PhOLEDs). This paper designed and prepared a simple solution-processable host material of TPA-PyF 2 based on triphenylamine and pyridine to fabricate efficient solution-processed PhOLEDs. TPA-PyF 2 featured an σ-linkage between the electron donor and acceptor units, which not only served to limit the conjugation length of the molecule and maintain a high triplet energy level, but also endowed the host molecule with a three-dimensional structure to enable high film morphological stability for solution processing. As a result, TPA-PyF 2 exhibited a high triplet energy level (2.82 eV), high thermal stability, bipolar charge transfer, and excellent film morphology. Blue solution-processed OLED with a simple double-layer structure based on TPA-PyF 2 host achieved a maximum current efficiency, power efficiency, and luminance of 17.2 cd/A, 7.1 lm/W, and 11519 cd/m 2 , respectively, with a small efficiency roll-off of only 9.1% at the practical luminance of 1000 cd/m 2 . This work reveals that the σ-linkage strategy is promising in designing efficient solution-processable host materials for high-efficiency PhOLEDs.
研究领域:
材料科学
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有机电子学
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产品关联
DOI
高影响因子
SYNTHETIC METALS
·
2021
·
IF 3.266
Yanyu Gao,Wei Zhang,Dongxu Li,Xiaoxue Lin,Xin Qiao,Haijun Niu,Wen Wang
Electrochromic (EC) materials have captured intense attentions in the field of smart window, label screen and camouflage recently. The structure of EC active group is crucial to the properties of product. In this study, novel PAs with EC and memory properties were developed by polycondensation of asymmetry triarylamine N, N ' -bis(4-aminophenyl)-N-isopropyl-N ' -phenylbenzene-1,4-diamine (IPATAA) with five different dicarboxylic monomers. An isopropyl group of the IPATAA molecule is linked to a nitrogen atom to increase electron density and solubility. Furthermore, PAs are apt to be processed into a film by spin-coating or printing. After electro-oxidation, PAs films change from colorless to blue. The coloring time and bleaching time is 2.8–4.1 s and 2.6–4.5 s, respectively. The highest coloring efficiency of PAs film is 366 cm 2 C −1 . Memory devices made using the PAs show non-volatile memory characteristics such as lower switching threshold voltages (<1.08 V) and better switching current ratios (>2 × 10 4 ).
研究领域:
材料科学
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电子器件
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 137
·期 24
·48808
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IF 2.188
Shuwei Cai,Haijun Niu
In this study, four novel triarylamine-based polyimides with different substituted groups (tert-butyl and -H) containing pyrrole moieties were successfully prepared by polycondensation reaction. The electrochemical and electrochromic properties of the polyimides were measured by cyclic voltammetry and spectro-electrochemistry. The polyimides exhibited obvious electrochromic behavior with good thermal stability (the 10% weight-loss temperatures were recorded in the range of 345-386°C), film-forming ability and reversible stability after 1000 s. The color of the polyimide films changed from colorless to light blue or yellow to blue on increasing the applied potential. The highest coloration efficiency reached up to 190 cm 2 C −1 . The polyimide films exhibited a stable response to the light (on or off) after 200 s. Especially, PyHBTPI displayed effective solubility, superior optical contrast (~30%) in the visible region, faster response time (1.19 s for coloring process), and obvious color change from yellow to blue with good stability, thus, confirming the potential use for high contrast displays. Overall, the study demonstrates the successful development of high-performance polyimides for electrochromic and optoelectronic behaviors. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48808.
研究领域:
材料科学
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电化学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2018
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IF 3.235
Shuwei Cai,Shuzhong Wang,Dongxu Wei,Haijun Niu,Wen Wang,Xuduo Bai
Four kinds of novel polyamides (PAs) containing pyrrole core with different triarylamine (TAA) groups were designed and synthesized. These PAs exhibit good solubility in various organic solvents and excellent thermal stability. The two PAs prepared from cyclohexane-1,4-dicarboxylic acid exhibit fluorescence maximum at 475–476 nm with quantum yields up to 39.0% and 57.3% in N , N -dimethylacetamide (DMAc) solution. Furthermore, the polymer films show reversible electrochemical redoxidation with color changing from yellowish to khaki to dark blue. Especially, the films have high coloration efficiency (up to 143 cm 2 C −1 at 750 nm) and after over 1000 s the films still exhibit continuous cyclic stability of electrochromism . What's more, these PAs could be used as the photoelectric conversion material owing to their excellent optoelectronic properties.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Jiaqi Li,Yingyi Nong,Jisong Yao,Leimeng Xu,Zhi Yang,Shalong Wang,Jizhong Song
Metal halide perovskite quantum dot-based light-emitting diodes (QLEDs) have garnered considerable attention for realizing wide color gamut displays. Despite the breakthrough achieved in sky-blue perovskite QLEDs, it is still challenging to realize efficient Rec. 2020-blue perovskite QLEDs. Herein, a triphenylamine derivative-tailored hole transport layer (HTL) strategy is proposed for improving hole injection in deep-blue perovskite QLEDs. The hole mobility of the tailored HTL (T-HTL) is enhanced by ≈3.5 times compared to the pristine HTL (P-HTL) by mixing the 4,4′-cyclohexylidenebis [N, N-bis(p-tolyl) aniline] (TAPC) into poly [bis(4-phenyl) (4-butylphenyl) amine] (Poly-TPD), and the highest occupied molecular orbital (HOMO) level of T-HTL is shifted down by 0.11 eV compared to P-HTL, facilitating hole injection into the emitting layer. The resulting deep-blue perovskite QLEDs exhibit an external quantum efficiency of 11.0% at 465 nm, meeting the Rec. 2020 standard and representing the state-of-the-art deep-blue perovskite QLEDs. Theoretical calculations and experimental results demonstrate that the enhanced hole transport capacity of the T-HTL is attributed to the intermolecular π–π stacking between TAPC and Poly-TPD. Other triphenylamine derivatives can also tailor the hole transport capacity and improve device performance, which demonstrates the universality of the proposed strategy.
研究领域:
材料科学
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光电工程
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产品关联
DOI
高影响因子
RSC Advances
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2015
·Vol. 5
·期 19
·14879-14886
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IF 3.84
Jinrui Lin,Xiuyuan Ni
Two triarylamine-based polymers were synthesized by oxidative coupling reactions from 3-(N,N-diphenylamino) thiophene (3PAT) and 3-(10H-phenothiazin-10-yl) thiophene (3PTT) monomers, respectively. Distinguished from 3PAT, 3PTT has an additional sulfur atom between the two benzene rings. By using NMR spectroscopy and triarylamine control, the structures of the synthesized polymers were resolved with the aim of revealing the substitution effect. The results present that the substituent plays an important role in the chain propagation. Moreover, the triarylamine-based polymers were investigated for their solubility, thermal stability and electrochemical properties. To evaluate the electrochromism of the two different polymers, we have measured the spectroelectrochemical and electrochromic switching properties from the solution-cast films.
研究领域:
材料化学
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电化学
✓ 已验证
DOI
高影响因子
RSC Advances
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2017
·Vol. 7
·期 72
·45478-45483
·
IF 3.108
Jianchang Wu,Chang Liu,Xiang Deng,Luozheng Zhang,Manman Hu,Jun Tang,Wenchang Tan,Yanqing Tian,Baomin Xu
Two novel electron-rich linear small-molecules, containing benzene and thiophene as the cores with arylamine side groups, named HTM1 and HTM2, respectively, were synthesized via short, easy and efficient synthetic routes. The influence of the π-linkers of the two materials on photophysical, electrochemical, and thermal properties, and hole mobility and photovoltaic performance was investigated. The compound with thiophene as π-linker (HTM2) shows better solubility and higher hole-transporting mobility than the compound with benzene as π-linker (HTM1). When these two materials were incorporated into perovskite solar cells as hole transporting materials (HTMs), short circuit photocurrent densities (Jscs) of 15.83 mA cm−2 and 21.1 mA cm−2, open circuit voltages (Vocs) of 0.79 V and 1.09 V, and fill factors (FFs) of 0.46 and 0.62, were obtained. These factors contributed to average overall power conversion efficiencies (PCEs) of 6.4% and 13.9% with the best PCEs of 7.5% and 14.7%, respectively. The performance of HTM2 is comparable to the PCE obtained using the current state-of-the-art HTM of 2,2′,7,7′-tetrakis(N,N′-di-p-methoxyphenylamine)-9,9′-spirobifluorene (spiro-OMeTAD) with the best PCE of 17.4% using a similar device preparation method and measurement conditions. These results showed that selecting a suitable π-linker is important for the performance of HTMs. And the simple HTM2 material is a promising HTM with the potential to replace the expensive spiro-OMeTAD due to its comparable performance with a much simpler synthesis route and much reduced cost (10 times less than that of spiro-OMeTAD). This study demonstrates that a compound with a suitable π-linker could be a low-cost and high performance HTM to replace spiro-OMeTAD.
研究领域:
材料科学
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能源科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Lei Huang,Rong Guo,Qingqing Qiu,Huan Li,Putrakumar Balla,Jinming Zeng,Tongxiang Liang,Xiaopeng Qi,Ping Liu
Electrochromic energy storage materials that possess both electrochromic and electrochemical energy-storage properties have attracted significant attention for applications in visual energy-storage, energy-efficient windows, as well as displays. To fulfill their comprehensive applications, electrochromic energy-storage materials require specific characteristics, such as transparency, ambipolarity, multi-color capabilities, and high capacitance. Here, the polyimide covalent-organic framework based on triarylamine (PM-TPI and NT-TPI) COF films were grown successfully on FTO glass through solvothermal polycondensation, and exhibited crystallization, hierarchical porous structures, and ambipolar electrochemical redox activity. Notably, NT-TPI COF film displayed transparent bleached state, ambipolar electrochromism, multi-color (transparent, orange-red, cyan, gray), and high optical contrast. Due to their large specific surface area and efficient electron/ion transport ability, the NT-TPI COF film effectively controlled visible and near-infrared light, achieving optical contrasts of 49.8 % and 70.0 % at 420 and 850 nm, respectively. Moreover, the NT-TPI COF films showed promising electrochemical energy-storage properties and excellent charge–discharge rate performance, with a specific capacitance of 141.0 mAh/g. Additionally, NT-TPI COF/WO 3 -based ambipolar eclectrochromic energy-storage devices also exhibited high optical contrast from visible to near-infrared regions, and large capacitance. In summary, the NT-TPI COF film effectively combines the electrochromic and electrochemical energy-storage capabilities, making it a promising candidate for electrochromic energy-storage materials with transparency, ambipolarity, high optical contrast, multi-color functionality, and high specific capacitance.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
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2015
·
IF 4.504
Songtao Lv,Yakun Song,Junyan Xiao,Lifeng Zhu,Jiangjian Shi,Huiyun Wei,Yuzhuan Xu,Juan Dong,Xin Xu,Shirong Wang,Yin Xiao,Yanhong Luo,Dongmei Li,Xianggao Li,Qingbo Meng
We report two simple triphenylamine-based hole-transporting materials (HTMs) containing vinyl derivatives, 3,6-di(2-(4-(N,N-di(p-tolyl)amino)phenyl)vinyl)-2-thiophene (apv-T) and 3,6-di(2-(4-(N,N-di(p-tolyl)amino)phenyl)vinyl)-9-ethyl-carbazole (apv-EC) for the perovskite solar cells. According to theoretical calculation and experimental results, their HOMO energy levels are similar to that of conventional spiro -OMeTAD, which is supposed to be favorable for the hole transportation in the device. Up to 12% of light-to-electricity conversion efficiency has been achieved for the mesoporous TiO 2 /CH 3 NH 3 PbI 3 /apv-EC/Au solar cell without using p -type dopants. Time-resolved photoluminescence (PL) measurement and Electrochemical Impedance Spectra (EIS) further reveal that relatively high hole mobility of the apv-EC and weak recombination occurred at TiO 2 /CH 3 NH 3 PbI 3 /apv-EC interfaces of the device are crucial to the good performance in comparison with the apv-T. Advantages such as easy synthesis, low cost and relatively good cell performance provide a potential application as the replacement of the expensive spiro -OMeTAD.
研究领域:
材料科学
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能源科学
✓ 已验证
DOI
高影响因子
TETRAHEDRON
·
2022
·
IF 2.388
Yanan Gao,Xinwen Zhang,Jie Song,Liwei Dou,Hong Gao,Shibin Shang,Zhanqian Song
Dehydroabietic acid triarylamine (DTPA) synthesized from renewable natural rosin is an excellent hole-transporting material but is affected by aggregation-caused quenching in the solid state. Herein, two new biomass-based AIE luminogens (AIEgens), namely DTPA-TPE and 2DTPA-TPE, were synthesized through the attachment of DTPA to tetraphenylethene (TPE). Their aggregates in poor solvents and thin films have a strong emission with a fluorescence quantum yield of up to 67.4%. DTPA AIEgens exhibit superior thermal and morphological stability, showing high thermal degradation ( T 5d up to 412.0 °C) and glass transition ( T g up to 150.8 °C) temperatures. Electroluminescence (EL) devices with compounds used either as emitting layers (EMLs) or as EMLs and hole-transporting layers (HTLs) were constructed. The device with 2DTPA-TPE as the EML exhibits the best performance (turn-on voltage of 2.4 V, maximum luminance of 12,414 cd m −2 , current efficiency of 6.2 cd A −1 , and power efficiency of 6.5 lm W −1 ). The devices without the HTL ( N , N ′-di-1-naphthyl- N , N ′-diphenylbenzidine (NPB)) exhibit performances comparable with or better than those of the devices with NPB. These results indicate that these compounds are promising luminescent materials for non-doped organic light-emitting diodes.
研究领域:
有机化学
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材料科学
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光学工程
✓ 已验证
产品关联
DOI
高影响因子
DYES AND PIGMENTS
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2021
·
IF 4.889
Yanan Gao,Liwei Dou,Hong Gao,Jie Song,Shibin Shang,Zhanqian Song
D-π-D hole-transporting materials have the potential to be excellent dopant-free hole-transporting materials (HTMs) for perovskite solar cells (PSCs) because of their tunable energy levels, high charge mobility, good solubility, and excellent film-forming properties. In this paper, two series of D-π-D type compounds, Series 1 (2TPA-CZ1~2TPA-CZ3) and Series 2 (2DTPA-CZ1~2DTPA-CZ3), were synthesized by linking a carbazole derivative (as a π-bridge) to triaryamine or dehydroabietic acid triarylamine groups (the donor groups) via C–C coupling reactions. The optical, electrochemical, thermal, and photovoltaic properties in PSCs of these compounds were fully investigated. The two series of compounds exhibit good ultraviolet absorption, fluorescence emission , and electrochemical and thermal properties. In addition, their highest occupied molecular orbital levels and energy gaps make them suitable for use as hole-transporting materials in PSCs. Among the PSCs developed, Device 1, based on 2TPA-CZ1, showed the best performance, with a power conversion efficiency (PCE) of 12.27%, a open circuit voltage (V OC ) of 1.13 V, a short-circuit photocurrent density (J SC ) of 15.10 mA cm −2 , and a fill factor (FF) of 71.61%, which is comparable to that of a device based on the conventional hole-transporting material Spiro-OMeTAD. While the PCE of Devices 4–6 was lower than the PCE of Devices 1–3, Devices 4–6 exhibit better stability. This may be due to the higher T g and better film-forming properties of compounds formed using the dehydroabietic acid skeleton. In additional, the introduction of alkyl groups on the carbazole moiety decreased the efficiency of the PSC devices. These results demonstrate that the 2TPA-CZ1 compounds are promising HTMs for PSC applications.
研究领域:
材料科学
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能源科学
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有机化学
✓ 已验证
产品关联
DOI
高影响因子
ChemNanoMat
·
2022
·Vol. 8
·期 11
·e202200360
·
IF 3.82
Qiang Zhao,Yongrong Xia,Wei Xue,Zhao Song,Wei Lu,Dong Jin,Linghai Xie,Jianfeng Zhao,Naien Shi
Graphical A highly sensitive fluorescent sensor based on polystyrene and N,N -diphenylanthracen-2-amine composite fibers for the detection of nitroaromatic explosives via electrospun technology was constructed. Furthermore, electrospun nanofiber films with better sensing performance were achieved by doping LiCl into an electrospun precursor solution. The resulting nanofiber films fabricated by electrospun technology exhibited the high detection performance. The rapid, sensitive, and efficient detection of nitroaromatic explosives (NAEs) is extremely important for human health and public safety; however, it is still a big challenge, especially for the detection of trace amounts of explosive vapors. In this study, a small-molecule luminescent probe of an anthracene triarylamine derivative was synthesized and employed as a highly efficient and sensitive sensor for the detection of NAEs, including 2,4-dinitrotoluene (DNT), 4-nitrotoluene (4-NT), and nitrobenzene (NB). The fluorescence intensity varied linearly along with the concentration of NAEs in the diluted tetrahydrofuran solution. The K SV values (Stern-Volmer equation coefficient) were 2457, 1735, and 1286 M −1 for DNT, 4-NT, and NB, respectively (DNT>4-NT>NB). Furthermore, polystyrene/LiCl/AnPh electrospun fibrous films were manufactured and proved to be efficient fluorescence sensors for NAEs vapor. This quenching can be ascribed to the photo-induced electron transfer (PET) process between the AnPh probe and NAEs analytes. The large contact area between the nanofibers and analytes in the film also contributed to the efficient quenching effect. This work will stimulate the design of new fluorescent probes for electrospun fibrous NAEs sensors and pave the way for their applications in future practical fields of public safety control.
研究领域:
化学
·
材料科学
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公共安全
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）