研究對稱型結構之BBTA、BTAQ和D2-nPh系列有機薄膜的光學特性和自發輻射放大現象;Study on the Optical Properties and Amplified Spontaneous Emission of Symmetric BBTA, BTAQ, and D2-nPh Series Organic Thin Films

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题名:	研究對稱型結構之BBTA、BTAQ和D2-nPh系列有機薄膜的光學特性和自發輻射放大現象;Study on the Optical Properties and Amplified Spontaneous Emission of Symmetric BBTA, BTAQ, and D2-nPh Series Organic Thin Films
作者:	郭倩雯;Wen, Guo Qian
贡献者:	光電科學與工程學系
关键词:	自發輻射放大現象;螢光共振能量轉移;供體-受體-供體;Amplified Spontaneous Emission;Förster Resonance Energy Transfer，FRET;Donor-Acceptor-Donor
日期:	2025-07-29
上传时间:	2025-10-17 11:50:35 (UTC+8)
出版者:	國立中央大學
摘要:	本研究在系統性探討對稱型D-A-D(Donor-Acceptor-Donor結構有機分子於不同結構設計下之光學特性與自發輻射放大(Amplified Spontaneous Emission, ASE)行為，並建立分子結構與光學放大效率之間的關聯性。研究的材料有三個系列：BBTA (benzobistriazole)、BTAQ (benzobistriazolepyrazine)與D2-nPh系列，透過中心異構化、供體單元芳香環數調控，以及主客體摻雜方法，分析其在溶液態與薄膜態下之吸收光譜、光致發光(PL)、螢光量子產率(PLQY)與ASE閾值表現。實驗結果顯示，分子對稱性與共軛長度為影響光學性質之關鍵因素。以BBTA與BTAQ系列為例，中心異構化導致的幾何結構改變分子的能隙大小，進而產生明顯的吸收與放光波長紅移或藍移。此外，在 BTAQ 系列中，供體芳香環數的增加雖可提升PLQY，但當超過特定長度時反而造成分子扭曲，影響共軛程度與ASE效率。為進一步優化薄膜態下的ASE閾值，本研究利用螢光共振能量轉移(FRET)機制，選用PFO與CBP作為主體材料，並與客體材料摻雜形成主客體系統。實驗證明，當主體放光波段與客體吸收波段具有良好重疊時，可有效提升能量轉移效率並降低ASE閾值，特別是DIndFL-2-BTAQ在溶液態和薄膜態表現皆最優，為本研究中最佳光學放大材料。綜上所述，本研究不僅證實對稱型 D-A-D 結構有機分子具備良好的放光與ASE特性，更提供未來有機雷射與高效率光電元件開發之分子設計依據與方向。 ;This study aims to systematically investigate the optical properties and amplified spontaneous emission (ASE) behavior of symmetric D-A-D (Donor-Acceptor-Donor) structured organic molecules under various structural designs, and to establish the correlation between molecular structure and optical gain performance. Three major series of materials were examined: BBTA (benzobistriazole), BTAQ (benzobistriazolepyrazine), and D2-nPh. Through structural isomerization, tuning of donor aromatic ring number, and host-guest doping strategy, we analyzed their absorption spectra, photoluminescence (PL), photoluminescence quantum yield (PLQY), and ASE thresholds in both solution and thin-film states. The experimental results reveal that molecular symmetry and conjugation length are critical factors influencing optical performance. For example, in the BBTA and BTAQ series, geometric changes induced by central isomerization can modulate the molecular energy gap, resulting in significant redshift or blueshift in absorption and emission wavelengths. Furthermore, in the BTAQ series, increasing the number of donor aromatic rings enhances PLQY; however, excessive extension can introduce structural distortion, thereby reducing conjugation and ASE efficiency. To further optimize ASE thresholds in thin-film form, Förster Resonance Energy Transfer (FRET) was employed by selecting PFO and CBP as host materials, forming host-guest systems with the target emitters. The results demonstrate that effective spectral overlap between the emission of the host and the absorption of the guest significantly enhances energy transfer efficiency and reduces ASE thresholds. In particular, DIndFL-2-BTAQ exhibited the best performance in both solution and thin-film states, indicating it as the most promising optical gain material in this study. In conclusion, this research not only confirms the excellent emission and ASE characteristics of symmetric D-A-D structured organic molecules but also provides valuable molecular design guidelines for the future development of organic lasers and high-performance optoelectronic devices.
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