三种新的蒽衍生物[2-氯-9,10-二甲苯基蒽(DTACl),9,10-二甲苯基蒽-2-腈(DTACN)和9,10-二(萘-1-基)蒽]合成了2腈(DNACN)作为三重态受体,用于低功率上转换。研究了它们的线性吸收,单光子激发荧光和上转换荧光特性。受体在DMF中显示出高荧光产量。含有DTCCl,DTACN或DNA-CN的溶液中的敏化剂Pd II八乙基卟啉(PdOEP)在532 nm处有0.5 W cm -2的超低激发功率密度选择性激发,产生了反斯托克斯蓝光。最大转换量子效率(Φ UC对于一对PdOEP / DTACl,获得了17.4%的浓度。此外,通过猝灭实验定量研究了三重态-三重态能量传递过程的效率。实验结果表明,用于上转换的高效受体应将高荧光量子产率与敏化剂三重态的有效猝灭结合起来。
PHOTOPOLYMERISABLE COMPOSITION, MATERIAL OBTAINED BY POLYMERISING SUCH A COMPOSITION AND 3D PRINTING METHOD USING SUCH A COMPOSITION
申请人:ECOLE NORMALE SUPERIEURE DE LYON
公开号:US20210189156A1
公开(公告)日:2021-06-24
A photopolymerizable composition comprises at least a polymerizable resin, a photosensitizer, an annihilator, and a photoinitiator. The photosensitizer is formulated to absorb an excitation light signal received in a first range of wavelengths. The annihilator is formulated to emit a light signal in a second range of wavelengths different from the first. During the absorption of light by the photosensitizer in the first range of wavelengths, the annihilator emits a light signal in the second range, a photon energy of the emitted light signal being greater than a photon energy of the light signal received by the photosensitizer. The annihilator is also formulated to implement an energy transfer mechanism to excite the photoinitiator for polymerization of the resin. The excited photoinitiator is formulated to generate at least one polymerizable initiator to cause the polymerization reaction. Related methods, such as three-dimensional printing methods, and materials are also disclosed.