Wang Kai, Huang Suqin, Ding Ping, Liang Zuoqin, Chen Shuoran, Li Lin, Ye Changqing, Wang Xiaomei
Suzhou Key Laboratory of Flexible & Printing Optoelectronic Materials, School of Materials Science and Engineering, Suzhou University of Science and Technology Suzhou 215009 China
RSC Adv. 2021 May 17;11(29):17755-17759. doi: 10.1039/d1ra02528g. eCollection 2021 May 13.
Soluble 3,7,11,15-tetra(-butyl)phthalocyanine palladium (TBPcPd) and 3,7,11,15-tetra(pentyloxy)phthalocyanine palladium (POPcPd) were synthesized and employed as sensitizers in expectation of achieving red-to-yellow/green upconversion (UC), doped with rubrene (Rub) and 9,10-bis(phenylethynyl)anthracene (BPEA), respectively. Under excitation of a 655 nm diode laser (∼1.5 W cm), a maximum red-to-green UC efficiency of 0.07% and a maximum red-to-yellow UC efficiency of 8.03% were obtained and the latter can drive a Si-photodiode to generate obvious photocurrent. The results showed that although a large triplet energy-level difference (Δ = - ) of the sensitizer ( )/annihilator ( ) pair helps to improve the upconversion, the sensitizer/annihilator pair with a Δ value less than zero still works. However, when the Δ ≤ -0.05 eV, this bicomponent pair is not valid anymore. Thus, a comparison of the Δ value can predict whether the sensitizer/annihilator pair is useful, which presents a quantitatively evaluated approach for exploring new-type upconversion systems for the first time.
合成了可溶性3,7,11,15-四（丁基）酞菁钯（TBPcPd）和3,7,11,15-四（戊氧基）酞菁钯（POPcPd），并分别掺杂红荧烯（Rub）和9,10-双（苯乙炔基）蒽（BPEA）作为敏化剂，以期实现从红色到黄色/绿色的上转换（UC）。在655 nm二极管激光器（~1.5 W/cm）激发下，获得了最大0.07%的从红色到绿色的上转换效率和最大8.03%的从红色到黄色的上转换效率，后者能够驱动硅光电二极管产生明显的光电流。结果表明，尽管敏化剂（ ）/湮灭剂（ ）对的大三重态能级差（Δ = - ）有助于提高上转换效率，但Δ值小于零的敏化剂/湮灭剂对仍然有效。然而，当Δ≤-0.05 eV时，这种双组分对不再有效。因此，比较Δ值可以预测敏化剂/湮灭剂对是否有用，这首次提出了一种定量评估方法来探索新型上转换系统。
