Highly-efficient red-to-yellow/green upconversion sensitized by phthalocyanine palladium with high triplet energy-level. Issue 29 (17th May 2021)

• Record Type: Journal Article
• Authors: Wang, Kai; Huang, Suqin; Ding, Ping; Liang, Zuoqin; Chen, Shuoran; Li, Lin; Ye, Changqing; Wang, Xiaomei
• Is Part Of: RSC advances. Volume 11:Issue 29(2021)
• Page Start: 17755
• Page End: 17759
• Publication Date: 2021-05-17
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d1ra02528g
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Soluble phthalocyanine palladium derivatives were synthesized and employed as sensitizers to achieve red-to-yellow/green upconversion, when doped with different annihilators. Abstract : Soluble 3, 7, 11, 15-tetra( tert -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 −2 ), 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 E = 3 E sen. − 3 E anni. ) of the sensitizer ( 3 E sen. )/annihilator ( 3 E anni. ) pair helps to improve the upconversion, the sensitizer/annihilator pair with a Δ E value less than zero still works. However, when the Δ E ≤ −0.05 eV, this bicomponent pair is not valid anymore. Thus, a comparison of the Δ E 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.