Organic spontaneous emission approaching the monochromatic limit

• 成果类型: Article
• 署名作者: Mamada, Masashi; Kataoka, Kota; Ochi, Junki; Lee, Taehwan; Matsumoto, Ryuji; Yoshioka, Mayu; Fukushima, Daisuke; Hatakeyama, Takuji
• 署名单位: Kyoto University; Sumitomo Chem Co Ltd; Sumitomo Chem Co Ltd
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-8075; 1095-9203
• DOI: 10.1126/science.aee0001
• 发表日期: 2026-06-11
• 页码: 1148-1153
• 关键词: ACTIVATED DELAYED FLUORESCENCE; light-emitting-diodes; excitation-energies; excited-states; singlet; electroluminescence; approximation; driven

摘要

Spontaneous emission is inherently associated with spectral broadening mechanisms, resulting in finite bandwidth in the emitted light. Narrowing this linewidth toward the monochromatic limit has long been a central pursuit in photonics, as it determines the ultimate color purity of nonstimulated light sources. Organic luminescent materials offer facile wavelength tunability but typically exhibit broad emission bands (>40 nanometers). The emergence of multiple-resonance emitters has provided a promising route to overcome this limitation, yet most reported systems remain within 20 to 30 nanometers. We present a molecular design strategy that amplifies the multiple-resonance effect through molecular repetition, yielding fluorescence with linewidths of 6.9 nanometers in toluene, 5.5 nanometers in 3-methylpentane, and 9.1 nanometers in a doped polymer film, placing this molecular framework among the narrowest-band organic luminophores reported.