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Modulation of a fluorescence switch based on photochromic spirooxazine in composite organic nanoparticles

机译：复合有机纳米粒子中基于光致变色螺恶嗪的荧光开关的调控

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摘要

We describe a versatile and convenient approach to achieve fluorescence modulation by the preparation of composite nanoparticles (CNPs), based on photochromic 5-methoxy-1,3,3-trimethyl-9'-hydroxyspiroindolinenaphthoxazine (SO), fluorescent 4-(dicyanomethylene)-2-methyl-6-(p-dimethyl- aminostyryl)-4H-pyran (DCM), and emissive-assistant 1,3- bis( pyrene) propane (BPP) molecules, employing doping techniques. The mechanism of the fluorescence switch is the intermolecular energy transfer as supported by both steady-state and time-resolved spectroscopy results. The addition of BPP not only enhances the contrast of the fluorescence signal between the 'ON' and 'OFF' state, but also provides a convenient way to tune the excitation wavelength for reading the fluorescence. High-contrast ON/OFF (20:1) fluorescence switching is successfully implemented in the CNPs and also in a more practical PVA film loaded with the CNPs. This system may represent an alternative to the covalent system in potentially rewritable high-density optical data or image storage utilizing luminescence intensity readout schemes.
机译：我们描述了一种多功能且方便的方法，通过基于光致变色的5-甲氧基-1,3,3-三甲基-9'-羟基螺吲哚萘并恶恶嗪（SO），荧光4-（二氰基亚甲基）制备复合纳米颗粒（CNP）来实现荧光调制。 -2-甲基-6-（对二甲基-氨基苯乙烯基）-4H-吡喃（DCM）和发射辅助1,3-双（pyr）丙烷（BPP）分子，采用掺杂技术。荧光开关的机制是稳态和时间分辨光谱结果均支持分子间能量转移。 BPP的添加不仅增强了“ ON”和“ OFF”状态之间荧光信号的对比度，而且还提供了一种方便的方式来调整激发波长以读取荧光。高对比度的开/关（20：1）荧光切换已在CNP中成功实现，并且在装载了CNP的更实用的PVA薄膜中也得到了成功实现。该系统可以利用发光强度读出方案在潜在可重写的高密度光学数据或图像存储中代表共价系统的替代方案。

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