JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Wenhai Wang,Qing Chang,Ling Li,Jian-An Li,Dewu Yue,Shichen Su
Advances in polymeric matrices with ultralong and color-tunable phosphorescence were recently made, but their luminescence mechanism was not yet thoroughly understood. The current experimental and theoretical studies show that the red-shift of phosphorescence spectrum is caused by increasing the C–N and C=O of carbon dots in the polymeric matrix . In addition, theoretical calculations explain the charge transfer and spin orbit coupling of carbon dots in a system containing different covalent bonds . The phosphorescence emission color and lifetime can be modulated, which is applied into triple anti-counterfeiting of photo-stimulated-dependent color, time-dependent color, and time-dependent phosphorescence lifetime . In the application, the phosphorescence color of carbon dots in the polymeric matrix can be varied from deep blue (431 nm) to red (620 nm) with a maximal lifetime of 2.02 s and a maximum phosphorescence quantum yield of 20.1%. This work provides a new direction for the development of carbon dots with efficient and color-tunable ultra-long phosphorescence.
研究领域:
材料科学
·
化学
·
光子学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Science Advances
·
2020
·Vol. 6
·期 21
·
IF 13.117
R. Tian,S.-M. Xu,Q. Xu,C. Lu
To achieve efficient polymer-based room-temperature phosphorescence (RTP) materials, covalently embedding phosphors into the polymer matrix appeared as the most appealing approach. However, it is still highly challenging to fabricate RTP materials on a large scale because of the inefficient binding engineering and time-consuming covalent reactions. Here, we have proposed a scalable preparation approach for RTP materials by the facile B─O click reaction between boronic acid–modified phosphors and polyhydroxy polymer matrix. The ab initio molecular dynamics simulations demonstrated that the phosphors were effectively immobilized, resulting in the suppressed nonradiative transitions and activated RTP emission. In comparison to the reported covalent binding time of several hours, such a B─O click reaction can be accomplished within 20 s under ambient environment. The developed strategy simplified the construction of polymer-based RTP polymeric materials by the introduction of facile click chemistry. Our success provides inspirations and possibilities for the scale-up production of RTP materials.
研究领域:
材料科学
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高分子化学
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点击化学
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光学材料
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磷光
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 17
·6333-6340
·
IF 5.7
Ziguo He,Mukfung Yuen,Cheng Zhang,Jian Zhang,Zhicai Wang,Caibo Yue,Mingfu Ye,Kui Zhang
Coal-derived carbon dots inherit the rich functional groups of raw coal, which makes them easy to be modified, and have important applications in chemical analysis, biomedicine, optoelectronic devices and other fields due to their excellent properties. In this work, we achieved room-temperature phosphorescence (RTP) emission of coal-based humic acid-derived carbon dots (HACDs) in boric acid for the first time. The results show that the boron–carbon bonds are prone to generate between HACDs and boric acid under heating conditions. Besides, the surface of the prepared HACDs contains numerous phenolic hydroxyl groups, which are easily oxidized by hydrogen peroxide into carbonyl groups, improving the phosphorescence lifetime. The resultant RTP materials exhibit an ultra-long phosphorescence lifetime of 632.20 ms with an outstanding afterglow as long as 9.0 s, and the phosphorescence quantum yield is 7.6%. This work provides guidance for finding earth-abundant and cost-effective carbon sources and a novel means to modulate the emission mechanism of coal-derived carbon dots.
研究领域:
化学
·
材料科学
✓ 已验证
DOI
高影响因子
Materials Today Chemistry
·
2025
·
IF 6.7
Peng Jin,Xinyi Li,Liya Zhang,Wei Wang,Yuhong Zhang,Yi Wu,Zhengguang Sun,Yuan Zhan
Room temperature phosphorescent (RTP) materials have promising application in display lighting, environmental monitoring, and information encryption. In this study, a series of RTP halogen doped carbon dots/SiO 2 composites (RTP X-CDs/SiO 2 , X = F, Cl, Br, I) with long lifetime and tunable particle size were successfully prepared by two-step process involving solvothermal and calcination. The effects of various halogen dopants on the phosphorescence properties and morphologies of the RTP X-CDs/SiO 2 composites were thoroughly investigated. Among them, RTP F-CDs/SiO 2 exhibit an ultra-long lifetime of 1.28 s, a phosphorescence quantum yield of 19.76 %, and remarkable stability against temperature variations, acid and alkali conditions, and exposure to polar solvents. Therefore, RTP F-CDs/SiO 2 were further incorporated into silicone resin to fabricate phosphorescent films, and optical and hydrophobic properties of films with varying RTP F-CDs/SiO 2 mass fractions (2.5 %–15.0 %) were systematically explored. The films demonstrate excellent fluorescence and RTP performance, highlighting their potential for advanced anti-counterfeiting and information encryption.
研究领域:
材料科学
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光学材料
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纳米技术
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信息安全
·
化学合成
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2024
·
IF 10.7
Xi Wang,Xiao Meng,Tongtong Cui,Qian Hu,Bowen Jin,Yisheng He,Xingjun Zhu,Chunhong Ye
Room temperature phosphorescence (RTP) materials with wood as framework are highly desirable due to their extended afterglow , high haze and good mechanical properties, which is highly desired in lighting materials. However, it remains challenging to obtain wood-based RTP materials that possess on-demand afterglow colors while maintaining high transparency across the entire visible spectrum. In this study, long-persistent phosphorescent transparent composite with tunable afterglow color is fabricated by infiltrating delignified wood with phosphors (including carbazole , naphthalene , and pyrene) doped polymethyl methacrylate (PMMA). Such RTP woods indicate remarkable transparency, over 70 %, and an extended afterglow duration of up to 8 s. Here, PMMA serves as rigid surrounding to suppress the non-radiative transition of phosphors to ensure phosphorescence, and to fulfill in the wood lumen to match the refractive index of cellulose for transparency. By formulating phosphors with different types and concentration ratios, transparent woods with diverse phosphorescence colors, and white emission, are successfully achieved. Furthermore, the RTP woods demonstrate dynamically tunable afterglow colors over time based on the varied phosphorescent lifetimes. Characterized by their high transparency and tunable colors, these natural wood-based RTP materials have great potentials for application in the fields of LED materials, optics, and building materials.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LANGMUIR
·
2018
·
IF 3.789
Yifang Gao,Hui Han,Wenjing Lu,Yuan Jiao,Yang Liu,Xiaojuan Gong,Ming Xian,Shaomin Shuang,Chuan Dong
Efficient room-temperature phosphorescence (RTP) of carbon dots (CDs) usually is seriously limited to appropriate solid matrix or introduced heavy atoms responsible for promoting intersystem crossing and suppress vibrational dissipation between singlet and triplet states. So, facile preparation efficient RTP of CDs with nonmatrix is still a highly difficulty and challenging task. Here, we first reported a subtle strategy to induce highly efficient free-matrix RTP of nitrogen-doped CDs (NCDs). The NCDs are composed of a core and hydrophilic surface of polyaspartic acid chains arising from high-temperature polymerization by a one-pot heating treatment of l-aspartic acid and d-glucose. The obtained NCDs have an ultralong phosphorescence lifetime of 747 ms and a high phosphorescence quantum yield (PQY) of 35% under 320 nm excitation in air. To the best of our knowledge, the PQY is currently the highest values recorded for RTP of CDs. The facile preparation and unique optical features offer these NCDs potential application in numerous applications, such as anticounterfeiting and white light-emitting diodes.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2023
·
IF 5.7
Minghui Zhou,Jun Sun,Bei Zhang,Youjie Hua,Feifei Huang,Hongping Ma,Renguang Ye,Shiqing Xu
Phosphor-in-ceramic (PiC) has garnered considerable attention in high-power white laser lighting owing to its advantages, such as high efficiency and good thermal stability. In this study, a transparent hydroxyapatite (HA) ceramic was successfully prepared via spark-plasma sintering (SPS) under relatively mild conditions. A series of ultra-high efficiency green-emitting PiCs were obtained by pure HA ceramics with 1–12% Lu 3 Al 5 O 12 : Ce (LuAG) phosphors. Owing to the rapid sintering of SPS and the stability of HA ceramics, HA ceramic matrix has high transparency, and does not damage the crystal structure of the LuAG phosphor. When excited by a blue laser, the HA-LuAG PiC exhibited an excellent luminous efficacy of 300.48 lm·W −1 . The fluorescence saturation threshold of the laser power was approximately 7.90 W. These results demonstrate that HA-LuAG PiCs have great potential for applications as efficient green-emitting phosphor conversion materials for high-power laser lighting.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yulei Gao,Qiannan Zhang,Fenfen Wang,Pingchuan Sun
Developing color-tunable pure organic room-temperature phosphorescent (RTP) materials based on biopolymers is of great significance for efficient utilization of natural resources, yet still challenging. Herein, tunable multicolor phosphorescence emission, including white-light, is achieved in cellulose-based RTP materials by co-organizing complementary cyan and red organic phosphors into the strong hydrogen-bonding networks of cellulose. The non-radiative transition of phosphors can be effectively suppressed by the high density of hydrogen bonding among the cellulose chains as well as the covalent interaction. The difference in optical properties between the two phosphors enables the adjustment of the phosphorescence emission color of the material from green to cyan, white and then red. It is demonstrated that the designed material can be used as versatile inks for pattern drawing and information encryption , with favorable multicolor emission and excellent aqueous processability. Therefore, considering the biodegradability and sustainability of cellulose materials, cellulose-based RTP has enormous potential in advanced anti-counterfeiting and information encryption as eco-friendly phosphorescent inks and coatings.
研究领域:
材料科学
·
生物材料
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Zhinan Jiang,Yang Liu,Lina Ding,Yonggang Yang,Tiantian Guan,Chaochao Qin,Yufang Liu
Star-shaped room-temperature phosphorescent (RTP) molecules have attracted much attention due to high luminescence efficiency by inhibiting nonradiative transition of triplet excitons . In this work, the photophysical processes of 1,3,5-tri(9h-carbazol-9-phenyl)benzene (TCzP) and tri(4-carbazol-9-phenyl)amine (TCzTa), with benzene and triphenylamine (TPA) as central cores respectively and carbazole (Cz) as peripheral groups, are investigated. The excited state absorption (ESA) signal (625 nm) of TCzP reaches maximum intensity within 8.8 ps in the femtosecond (fs) transient absorption (TA) spectroscopy and then decays significantly with the enhancing of triplet-triplet absorption (TTA) signal (425 nm). These evolution processes of spectral signal and the appearance of isosbestic point at 450 nm together confirm the intersystem crossing (ISC) process within 5.1 ns. The TTA signal gradually disappears in the nanosecond (ns) TA spectroscopy with a phosphorescence lifetime (τ ph ) of 2 μs. Compared to TCzP, TCzTa exhibits similar spectral evolution behavior with faster ISC of 2.1 ns and lower τ ph of 0.95 μs. The theoretical simulation shows that the nitrogen atoms in the TPA core of TCzTa leads to a significantly increased spin-orbit coupling constant of S 1 →T n (0.86 cm −1 ) and T 1 →S 0 (0.08 cm −1 ) than that of TCzP (0.25 cm −1 and 0.05 cm −1 ), resulting in the shorter experimental ISC rate constants (2.1 ns) and τ ph (0.95 μs). This work provides reasonable insights for understanding the real-time spectral signal evolution of star-shaped carbazole-based RTP molecules.
研究领域:
物理化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-12
·
IF 15.7
Li Xin,Li Wenlang,Deng Ziqi,Wang Jingtian,He Shan,Ou Xinwen,Phillips David Lee,Xiao Guanjun,Zou Bo,Kwok Ryan T. K.,Sun Jianwei,Lam Jacky W. Y.,Guo Zhihong,Tang Ben Zhong
Achieving long-lived room temperature phosphorescence (RTP) in organic materials has garnered significant attention in the field of optoelectronics. Although many host−guest systems with versatile performances have been developed, their photophysical mechanisms remain unclear due to the complicated intermolecular interactions and multiple energy transfer pathways, leading to unavoidable trial-and-error in molecular designs. Here we reveal that the dynamic coupling process in the excited state is crucial for inducing phosphorescence, where host and guest molecules firstly couple to enhance the intersystem crossing efficiency, and then decouple to transfer excitons to the triplet state of guest. Such a process shows universal applicability and tunable performance, with the longest lifetime for red RTP ( τ P = 2.4 s) reported so far. We anticipate the present work as a starting point for more sophisticated models on excited-state dynamic behaviors within host−guest systems.
研究领域:
光学材料
·
光电子学
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物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF PORPHYRINS AND PHTHALOCYANINES
·
2022
·Vol. 26
·期 12
·884-890
·
IF 1.914
Lixin Liu,Bo Han,Yu Cao,Jingji Wen
The room-temperature phosphorescence (RTP) of metalloporphyrins, induced by the heavy atom effect (HAE), has been widely concerned in many fields, and the intense emission of RTP is highly desired. The phosphorescent transition rate ( k P ) has been used to quantitatively characterize the HAE’s intrinsic nature. However, the phosphorescent intensity was not determined by k P alone, non-phosphorescent transition ( k n P ) induced by surrounding factors was also involved. In this study, the influence of k n P on the RTP of palladium octaethylporphyrin (PdOEP), platinum octaethylporphyrin (PtOEP), and platinum tetraphenylporphyrin (PtTPP) was studied. The effect of k n P can be quantitatively described by an introduced parameter η , which was defined as η = k P /( k P + k n P ) . The method is proposed for determining the η of PdOEP, PtOEP, and PtTPP by the UV-visible absorption spectra, luminescence spectra, and phosphorescence dynamic curves. Our research provides a way to understand the effect of knP on the RTP, and may benefit the development and optimization of metalloporphyrins aiming at intense RTP.
研究领域:
化学
·
材料科学
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2016
·Vol. 45
·期 42
·16889-16895
·
IF 4.177
Lixin Zang,Huimin Zhao,Jianyu Hua,Feng Qin,Yangdong Zheng,Zhiguo Zhang,Wenwu Cao
A mechanism for the enhanced room-temperature phosphorescence (RTP) of gadolinium-coordinated hematoporphyrin monomethyl ether (Gd-HMME) in the presence of imidazole and free gadolinium ions (Gd3+) is revealed. Imidazole, the molten solvent used in the synthesis of Gd-HMME, was effective in enhancing the Gd-HMME RTP. In the presence of imidazole, further enhancement of the Gd-HMME RTP was observed upon adding Gd3+. Overall, a 40-fold enhancement of Gd-HMME RTP intensity was achieved by adding both imidazole and Gd3+. In addition, there was an increase in the RTP lifetime. Through spectroscopic analysis, we deduced that a protective medium is formed by the imidazole and the degree of this protection is further increased by Gd3+. The protective medium enhances the Gd-HMME RTP by partially inhibiting energy transfer from the lowest triplet state of Gd-HMME to oxygen. This was demonstrated by the presence of lower levels of singlet oxygen in the Gd-HMME solution after the addition of imidazole. These results indicate that imidazole could have potential application as an RTP enhancer or triplet state protector.
研究领域:
化学
·
材料科学
·
光化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）