Efficient and long-lived room temperature phosphorescence materials via melt-injection reactions

IF 4.2 3区工程技术 Q2 CHEMISTRY, APPLIED

Dyes and Pigments Pub Date : 2025-09-22 DOI:10.1016/j.dyepig.2025.113270

Song Liu, Henggang Wang, Dongbo Chen, Chenglong Ji, Zhenguang Wang

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引用次数: 0

Abstract

Developing efficient, long-lasting room-temperature phosphorescence (RTP) materials via a simple synthesis strategy remains highly desirable yet challenging. Herein, we report a melt-injection reaction for the synthesis of RTP materials, wherein guest molecules and paraformaldehyde are injected into molten urea. Strikingly, this approach transforms the originally weak emission of guest molecules into RTP materials with a photoluminescence quantum yield of 76 % and an emission lifetime of 4.6 s. The efficient and long-lived RTP are attributed to a matrix stabilization mechanism: upon injecting formaldehyde into molten urea, a urea-formaldehyde (UF) matrix forms in situ, concomitantly incorporating guest molecules. Hydrogen bonding between the UF matrix and guest molecules drives the formation of cross-linking networks, which not only narrow the energy gap between singlet and triplet states but also restrict guest molecular motion. Furthermore, the rigid UF matrix shields triplet excitons from quenching by oxygen and water, synergistically enhancing RTP performance. As a proof-of-concept application, these RTP materials were employed as photo conversion layers to fabricate information encryption devices. This study provides new insights into RTP material design and highlights their promising potential in information security, chemical sensing, and bio-imaging.

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通过熔融注入反应制备高效长寿命的室温磷光材料

通过简单的合成策略开发高效，持久的室温磷光（RTP）材料仍然是非常理想的，但具有挑战性。本文报道了一种熔融注射反应，将客体分子和多聚甲醛注入熔融尿素中，用于合成RTP材料。引人注目的是，该方法将原本微弱的客体分子发射转化为RTP材料，光致发光量子产率为76%，发射寿命为4.6 s。高效和长寿命的RTP归功于基质稳定机制：将甲醛注入熔融尿素后，尿素-甲醛（UF）基质在原位形成，同时结合客体分子。UF基质与客体分子之间的氢键驱动交联网络的形成，不仅缩小了单线态和三重态之间的能隙，而且限制了客体分子的运动。此外，刚性UF基体保护三重态激子不被氧和水淬灭，协同提高RTP性能。作为概念验证的应用，这些RTP材料被用作光转换层来制造信息加密设备。该研究为RTP材料的设计提供了新的见解，并突出了其在信息安全、化学传感和生物成像方面的潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Dyes and Pigments 工程技术-材料科学：纺织

CiteScore

8.20

自引率

13.30%

发文量

933

审稿时长

33 days

期刊介绍： Dyes and Pigments covers the scientific and technical aspects of the chemistry and physics of dyes, pigments and their intermediates. Emphasis is placed on the properties of the colouring matters themselves rather than on their applications or the system in which they may be applied. Thus the journal accepts research and review papers on the synthesis of dyes, pigments and intermediates, their physical or chemical properties, e.g. spectroscopic, surface, solution or solid state characteristics, the physical aspects of their preparation, e.g. precipitation, nucleation and growth, crystal formation, liquid crystalline characteristics, their photochemical, ecological or biological properties and the relationship between colour and chemical constitution. However, papers are considered which deal with the more fundamental aspects of colourant application and of the interactions of colourants with substrates or media. The journal will interest a wide variety of workers in a range of disciplines whose work involves dyes, pigments and their intermediates, and provides a platform for investigators with common interests but diverse fields of activity such as cosmetics, reprographics, dye and pigment synthesis, medical research, polymers, etc.