Key Laboratory of Chemical Biology of Hebei Province, Key Laboratory of Medicinal Chemistry and Molecular Diagnosis, Ministry of Education, College of Chemistry and Materials Science, Hebei University, Baoding, 071002, China.
Tianjin Key Laboratory of Chemical Process Safety, School of Chemical Engineering and Technology, Hebei University of Technology, Guangrong Dao 8, Hongqiao District, Tianjin, 300130, P. R. China.
Adv Sci (Weinh). 2023 May;10(15):e2300139. doi: 10.1002/advs.202300139. Epub 2023 Mar 22.
Inorganic boric acid (BA) is generally not considered an efficient afterglow material, and several groups have reported its extremely weak room-temperature phosphorescence (RTP) in the blue spectral region. It is discovered that heat treatment of BA results in increased afterglow intensity (27-fold increase) and prolonged emission lifetime (from 0.83 to 1.59 s), attributed to enhanced through-space conjugation (TSC) of BA. The afterglow intensity of BA can be increased further (≈415 folds) by introducing p-hydroxybenzoic acid (PHA), which contains a conjugated molecular motif, to further promote the TSC of the BA system. This combination results in the production of afterglow materials with a photoluminescence quantum yield of 83.8% and an emission lifetime of 2.01 s. In addition, a tunable multicolor afterglow in the 420-490 nm range is achieved owing to the enhancement of the RTP and thermally activated delayed fluorescence of PHA, where BA exerts a confinement effect on the guest molecules. Thus, this study demonstrates promising afterglow materials produced from extremely abundant and simple precursor materials for various applications.
无机硼酸（BA）通常不被认为是一种有效的余辉材料，有几个研究小组已经报道了其在蓝色光谱区域内极其微弱的室温磷光（RTP）。研究发现，BA 的热处理导致余辉强度增加（增加了 27 倍）和发射寿命延长（从 0.83 秒增加到 1.59 秒），这归因于 BA 的增强的通过空间共轭（TSC）。通过引入含有共轭分子结构的对羟基苯甲酸（PHA），可以进一步提高 BA 体系的 TSC，从而进一步提高 BA 的余辉强度（≈415 倍）。这种组合产生了余辉材料，其光致发光量子产率为 83.8%，发射寿命为 2.01 秒。此外，由于 PHA 的 RTP 和热激活延迟荧光的增强，实现了 420-490nm 范围内可调谐的多色余辉，其中 BA 对客体分子施加了限制作用。因此，这项研究展示了具有前景的余辉材料，它们是由极其丰富和简单的前体制备而成的，可应用于各种领域。
