Cocrystallization Boosted Performance of Room Temperature Phosphorescence Afterglows from Pure Organics

doi:10.6023/cjoc202401023

Chinese Journal of Organic Chemistry ›› 2024, Vol. 44 ›› Issue (8): 2588-2594.DOI: 10.6023/cjoc202401023 Previous Articles Next Articles

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共晶提升纯有机材料室温磷光余辉性能

崔怡静^a^,^b, 朱天文^a^,^b, 张强^a^,^b, 袁望章^a^,^b^,^*()

a 上海交通大学化学化工学院变革性分子前沿科学中心上海市电气绝缘与热老化重点实验室上海电化学能源器件工程技术研究中心上海 200240
b 中国科学院青海盐湖研究所盐湖资源绿色高值利用重点实验室西宁 810008

收稿日期:2024-03-23 修回日期:2024-04-24 发布日期:2024-05-10
基金资助:
国家自然科学基金(52073172); 国家自然科学基金(U22A20250)

Cocrystallization Boosted Performance of Room Temperature Phosphorescence Afterglows from Pure Organics

Yijing Cui^a^,^b, Tianwen Zhu^a^,^b, Qiang Zhang^a^,^b, WangZhang Yuan^a^,^b()

a Shanghai Engineering Research Center for Electrochemical Energy Devices, Shanghai Key Laboratory of Electrical Insulation and Thermal Aging, Frontiers Science Center for Transformative Molecules, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240
b Key Laboratory of Green and High-End Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008

Received:2024-03-23 Revised:2024-04-24 Published:2024-05-10
Contact: *E-mail: wzhyuan@sjtu.edu.cn
Supported by:
National Natural Science Foundation of China(52073172); National Natural Science Foundation of China(U22A20250)

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Abstract

Pure organic materials with persistent room-temperature phosphorescent (p-RTP) have attracted extensive attention due to their unique photophysical properties, low cost, design flexibility, and promising applications in such areas as biomedical imaging, disease diagnosis and treatment, sensing, and anti-counterfeiting encryption. Achieving efficient, long-lived, and tunable p-RTP afterglows, however, remains a significant challenge. Herein, inspired by the clustering- triggered emission (CTE) mechanism, utilizing the cocrystallization strategy, cocrystals with stoichiometric ratio of 1∶1 were prepared by employing melamine (MA) and cyclic acylureas of hydantoin (HA) and dihydrouracil (DHU) as electron donor and acceptors, respectively. Compared to the single-component crystals of MA, HA, and DHU, the cocrystals exhibited better color-tunability and longer lifetimes for p-RTP emissions, which are attributable to the synergistic effects of the widespread presence of C=O groups, lone pair electrons, multiple hydrogen bonds, appropriate charge transfer, and multiple emissive clusters. Furthermore, advanced anti-counterfeiting and encryption applications of these cocrystalss were demonstrated.

Key words: persistent room temperature phosphorescence, afterglows, cocrystallization, clustering-triggered emission

Cite this article

Yijing Cui, Tianwen Zhu, Qiang Zhang, WangZhang Yuan. Cocrystallization Boosted Performance of Room Temperature Phosphorescence Afterglows from Pure Organics[J]. Chinese Journal of Organic Chemistry, 2024, 44(8): 2588-2594.

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Fig. & Tab. 6

Figure 1. Structures of MA, HA and DHU, and the cocrystallization design concept of the system

Figure 2. (a) Photographs taken under 285, 312, and 365 nm UV lights or after ceasing the irradiations and (b) delayed (td=1 ms) emission spectra with different λexs of HA and MA-HA, RTP decay curves of (c) HA and (d) MA-HA (<τp> is the fitted maximum lifetime), and (e) CIE coordinate diagram of the p-RTP emission of MA-HA cocrystals with different λexs

Figure 3. (a) Photographs taken under 285, 312, and 365 nm UV lights or after ceasing the irradiations and (b) delayed (td=1 ms) emission spectra with different λexs of DHU and MA-DHU, RTP decay curves of (c) DHU and (d) MA-DHU (<τp> is the fitted maximum lifetime), and (e) CIE coordinate diagram of the p-RTP emission of MA-DHU cocrystals with different λexs

Figure 4. Structures, intermolecular interactions, and molecular packing of MA-HA cocrystals

Figure 5. (a) Electric potential distributions of the excited states of monomers and (b) electron density distributions of HOMO and LUMO levels for momomers

Figure 6. Demonstration of the multi-mode anticounterfeiting and encryption applications of MA-HA cocrystals

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共晶提升纯有机材料室温磷光余辉性能

Cocrystallization Boosted Performance of Room Temperature Phosphorescence Afterglows from Pure Organics

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