Journal of Materials Chemistry C
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2023
·Vol. 11
·期 26
·8767-8775
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IF 6.4
Bo Chen,Chuanxin Liao,Dewang Li,Hongli Liu,Shirong Wang
Thermally activated delayed fluorescence (TADF) emitters that satisfy the blue gamut of the BT.2020 standard have rarely been reported, severely hindering the application of TADF in full-color ultra-high definition (UHD) displays. Herein, three solution-processable ultra-deep-blue TADF emitters, namely BFCz-TDBA, ICz-TDBA and PIdCz-TDBA, were cleverly designed and synthesized by linking a rigid and symmetric oxygen-bridged boron acceptor directly to carbazole derivative donors with different strengths. All these TADF emitters exhibited ultra-deep-blue photoluminescence below 430 nm with a narrow full-width-at-half-maximum of less than 50 nm. Furthermore, their favorable solubility and thermal stability make them suitable for solution processing. The resultant solution-processed ultra-deep-blue organic light-emitting diodes (OLEDs) based on all the emitters exhibited a maximum external quantum efficiency of 12.0%, 13.0% and 12.2% for BFCz-TDBA, ICz-TDBA and PIdCz-TDBA, respectively. Correspondingly, their related Commission Internationale de l’Eclairage (CIE) chromaticity coordinates were (0.16, 0.044), (0.16, 0.049) and (0.16, 0.046), respectively, which represent the state-of-the-art deep-blue emission among solution-processed devices (CIEy < 0.05). The typical BT.2020 blue gamut of these materials demonstrate their enormous potential for application in UHD displays.
研究领域:
材料科学
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光学工程
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显示技术
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
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2025
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IF 4.7
Guozhu Ren,Tingyu Pan,Yue Xu,Jingyu Wang,Lingdong Wang,Ruiping Deng,Shihong Zhou,Long Tian,Xiaojie Wu,Liang Zhou
Since the O–H and N–H oscillators of solvent molecules attached to ytterbium ion (Yb3+) and C–H oscillators existing in the inner coordination sphere of Yb3+ would quench the excited energy of Yb(III), which leads to low quantum yields (QYs) of Yb(III) complexes, we aimed to design a ligand that could block solvent molecules and C–H oscillators out of the first coordination sphere of Yb3+. Herein, a series of novel polycyclic aromatic dicarboxylate ligands are designed and synthesized to effectively protect Yb3+ from solvent molecules and efficiently sensitize Yb3+ luminescence, while the cost and sophistication of the synthesis are satisfactory. Therein, [Yb(MO–DPyPDA)2](DIEA) exhibited a considerable QY of 5.20% and a long luminescent lifetime of 102 μs in CD3OD. The single-crystal structure demonstrates that there are no solvent molecules and C–H oscillators existing in the inner coordination sphere of Yb3+, which is conducive to alleviating the quenching effect. Meanwhile, we also carried out experiments to verify that it was thermodynamically feasible for ligands to sensitize the luminescence of center ion through internal redox processes. Moreover, several groups of near-infrared organic light-emitting diodes based on [Yb(DTFM-DPyPDA)2](DIEA) were fabricated based on the solution-processing method, and the highest irradiance of 110,284 μW/m2 was realized by optimizing the device structure.
研究领域:
材料科学
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光学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DYES AND PIGMENTS
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2018
·
IF 3.767
Bin Jia,Hong Lian,Tijian Sun,Hongen Guo,Xiaozhe Cheng,Jian Wu,Yi Chen,Qingchen Dong,Jinhai Huang
Two host materials H1 and H2 by introducing dibenzothiophene and dibezofuran moieties into the carbazole and pyridine derivative, respectively, are reported. Their structural and physical properties were fully characterized. The thermal analysis demonstrated that both H1 and H2 are thermally stable. The triplet energy levels of H1 and H2 were determined to be 2.66 and 2.51 eV, respectively. Green phosphorescent OLEDs with H1 and H2 acting as host materials were fabricated to investigate their performances in PHOLEDs . Green PHOLED based on H1 shows the best performance with the maximum power efficiency of 50.4 lm/W and the lowest driving voltage of 2.5 eV. The characteristic measurements of OLED devices reveal that both H1 and H2 are promising host materials for practical application. By comparing with the commercial host material of 4,4′-bis(carbazol-9-yl)biphenyl (CBP), the power efficiency of green PHOLED was enhanced by 31.6%.
研究领域:
材料科学
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有机电子学
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光电材料
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2021
·
IF 2.694
Renxin Wang,Yuanzuo Zou,Jingzhou Guo,Yuan Pu,Dan Wang
1,3,5-Tris(1-phenyl-1H-benzimidazol-2-yl)benzene (TPBi) is normally used as functional materials in organic light-emitting diodes (OLEDs) and the information about the solubilities of TPBi in organic solvents is crucial for the preparation of inks toward inkjet printing technology, which is considered to be a next-generation manufacturing method for OLED production. The solubilities of TPBi in 12 kinds of organic solvents, including n-hexane, cyclohexane, methanol, ethanol, isopropanol, n-butanol, acetonitrile, ethyl acetate, dimethyl sulfoxide, tetrahydrofuran, chlorobenzene, and trichloromethane, at the temperature range from 283.15 to 323.15 K and atmospheric pressure were determined based on the isothermal saturation method. The obtained solubility data were correlated by the modified Apelblat equation and the correlated results exhibited good agreement with the experimental data. The nanonization of TPBi was conducted via high gravity-assisted solvent/antisolvent precipitation processing, which showed a beneficial effect for film formation.
研究领域:
材料科学
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化学工程
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纳米技术
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有机电子学
✓ 已验证
产品关联
DOI
高影响因子
SYNTHETIC METALS
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2023
·
IF 4.4
Xinlei Yuan,Wei Tang,Xudong Liu,Hongji Jiang
2,4,6-Triphenyl-1,3,5-triazine, diphenylmethanone and triphenylphosphine oxide were introduced into the 9-position of one fluorene moiety to produce donor-acceptor vertically structured emitters DFTRZ , DFCO and DFPO . The T g of DFTRZ , DFCO and DFPO solid powder are 135 °C, 89 °C and 97 °C, and DFTRZ with the most rigid receptor of 2,4,6-triphenyl-1,3,5-triazine showed the highest thermal stability, whose T d reached 436 °C, far exceeding those of DFCO and DFPO . The absolute photoluminescence quantum yields of DFTRZ , DFCO and DFPO solid powders are 14.35%, 1.13% and 7.57%, and the molecular framework of DFTRZ is meaningful to enhance the absolute photoluminescence quantum yields of obtained emitters. The donor-acceptor vertical structures do not endow these emitters with expected thermally activated delayed fluorescence emission. Beside the local emission of fluorene-based dimers, DFTRZ exhibits additional intramolecular charge transfer emission in polar solvents. The unique polar-induced dual emission of DFTRZ in solvents deteriorates the emission purity of the obtained emitter, and this embarrassment can be eased by DFPO in some degree. However, the dual light emission of DFTRZ in some polar solvents is useful to be senser and produce white light emission in solution. The maximum luminance of devices with bis (2-methyldibenzo[ f , h ] quinoxaline) (acetylacetonate) iridium (III) doped in emitters DFTRZ , DFCO and DFPO is higher than those of 2,3,5,6-tetrakis[3,6-bis(1,1-dimethylethyl)− 9 H-carbazol-9-yl]benzonitrile doped devices, and the corresponding maximum luminance is 16050 cd·m −2 for DFTRZ , 4545 cd·m −2 for DFPO and 11025 cd·m −2 for DFCO . DFPO is the best host of blue light emitters for OLED applications in term of color purity.
研究领域:
材料科学
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光电技术
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有机电子学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Chuanshen Wang,Haorui Dun,Lu Liu,Hongliang Ding,Hongfei He,Bicheng Lin,Wenyu Hu,Na Sun,Yuan Hu,Bin Yu
Traditional early fire warning systems struggle to meet the active protection demands of complex scenarios of environmental interference. Developing fire warning technologies with fast-response, self-powered, and intelligent interlocking capability has become an urgent priority to enhance safety protection levels. This study synthesized a hierarchical nanocomposite material based on thermoelectric Ag₂Se and polydopamine@carbon nanotubes (PDA@CNT). This composite was subsequently applied to the surface of mechanically strong and thermally stable Poly( p -phenylene benzobisoxazole) (PBO) fiber films to fabricate a dual-layer fire warning film. The output voltage of the composite film exhibited a strong linear relationship with temperature and can achieve over 100 cycles of repeatable fire warnings. The system can issue an fire warning signal within 1 s upon exposure to a heating stage at 200 °C. In combination with Halloysite nanotubes (HNTs), the hierarchical nanocomposite material was applied to the surface of a flammable wood to construct a flame-retardant-early-warning structure. The treated wood achieved UL-94 V0, and 45.5 % and 42.1 % reductions in the peak heat release rate (pHRR) and total heat release (THR), respectively., while retaining its sensitive fire warning functionality with an issuing signals within 4 s upon contact with a heating stage at 100 °C. By integrating Internet of Things (IoT) technology, a wireless intelligent thermoelectric response fire warning system with adjustable thresholds was developed, enabling rapid fire detection and real-time wireless transmission of fire warning signals. Voltage signals can be monitored in real-time via OLED displays and mobile devices, and the adjustable fire warning threshold voltage demonstrates flexibility in adapting to diverse application scenarios, showcasing the great potential for next-generation intelligent IoT-based fire warning applications.
研究领域:
材料科学
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纳米技术
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消防安全工程
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物联网技术
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热电材料
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智能传感器
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无线通信系统
✓ 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）