| 摘要: | 近年來，有機發光材料近幾年受到廣泛的關注與研究，其中含有BF2的錯合物（Boron difluoride complex），因為其高螢光量子產率、化學穩定性等優點，受到廣泛關注。但部分BF2分子有自吸收現象及ACQ現象，進一步導致固態分子放光受限。故本研究針對防止分子產生ACQ的現象，設計並合成出一系列在BF2平面上修飾具有立體障礙取代基的BF2錯合物（B-Ph、B-1Np、B-2Np、B-1An、B-2An以及B-TPA）。我們分別在固態以及溶液態中進行探討。
首先在溶液態中，經由吸收光譜、放光光譜、螢光量子產率等一系列光物理研究，證實該系列分子具有高量子產率，且B-TPA展現出良好的溶劑化顯色性質。
在固態放光研究中，藉由放光光譜成功證實該系列分子具有良好的放光表現。並且經由X光單晶繞射分析，了解分子在固態的堆疊方式。特別是我們發現B-1Np因結構中立體障礙的影響，使其堆疊方式有別於該系列其他分子，導致其具有較藍的固態放光。
;In recent years, organic luminescent materials have attracted considerable attention and extensive research. Among them, boron difluoride (BF₂) complexes have emerged as promising candidates due to their high fluorescence quantum yields and excellent chemical stability. However, some BF₂ complexes suffer from self-absorption and aggregation-caused quenching (ACQ), which limit their solid-state emission performance.
In this study, we designed and synthesized a series of BF₂ complexes—B-Ph, B-1Np, B-2Np, B-1An, B-2An and B-TPA—by introducing bulky substituents onto the BF₂ core to create steric hindrance and thereby prevent ACQ behavior.
For solution state, photophysical studies including UV-vis absorption spectra, photoluminescence spectra, and fluorescence quantum yield measurements confirmed that all compounds exhibit high quantum yields. Notably, B-TPA demonstrated distinct solvatochromic behavior.
For solid-state emission, photoluminescence measurements revealed that the compounds also display strong emission. Furthermore, single-crystal X-ray diffraction analysis was employed to investigate the molecular packing. Interestingly, B-1Np, due to the steric hindrance in its structure, exhibited a unique packing compared to the other complexes, resulting in a noticeably blue-shifted solid-state emission. |
