Near-infrared-emitting upconverting BiVO4 nanoprobes for in vivo fluorescent imaging

Liu, Yuwei; Yin, Xiumei; Zhao, Hengzhi; Xin, Fangyun; Wang, Hong; Luo, Xixian; Gong, Ning; Xue, Xiongzhi; Pang, Qiang; Xing, Mingming; Tian, Ying

doi:10.1016/j.saa.2021.120811

Cited by 2 publications

(1 citation statement)

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“…Lanthanide ions (Ln 3+ )-doped up-conversion luminescence (UCL) materials have attracted significant interests in the areas of display, sensing, anti-counterfeiting, bioimaging and diagnostics owing to their superior optical properties of sharp and tunable 4f  4f emissions, resistance to photobleaching and no autofluorescence background [1][2][3][4][5][6]. However, the utilization of UCL material as a luminescence probe for bioimaging is currently restricted by the strong absorption of shortwavelength light (below 600 nm) by the tissues, resulting in limited efficacy [7].…”

Section: Introductionmentioning

confidence: 99%

A Novel Red-Emitting NaYS2 Phosphor Under 1550 nm Excitation

Wu,

Tian,

Wei

et al. 2023

Preprint

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Up-conversion luminescence (UCL) materials are of great importance due to their unique optical properties. In particular, the red UCL, falling into the optical transmittance window of biological tissues, can realize deep tissue penetration depth and high-resolution bioimaging. In this work, effective red UCL is achieved in the ternary sulfide by the introduction of Tm3+ or Ho3+ ions into Er3+ doped NaYS2 under 1550 nm excitation. The main emission peak is successfully tuned from green (NaYS2:Er3+) to highly efficient red luminescence (NaYS2:Er3+,Tm3+ and NaYS2:Er3+,Ho3+). The maximum red to green emission intensity ratio (IR/IG) increased by 31 and 80 times, respectively. The lifetime of 4I9/2(Er3+) level decreases significantly from 3432 s (NaYS2:Er3+) down to 636 (NaYS2:Er3+,Tm3+) and 423 s (NaYS2:Er3+,Ho3+), respectively. This is due to the altered energy transfer pathways, resulting in the population of 4F9/2(Er3+). The mechanisms of UCL and energy transfer processes are further supported by fluorescence decay dynamic measurements. The results show the realization of red-emissive UCL in the promising NaYS2 matrix, representing a new type of red UCL phosphors.

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