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JOURNAL OF RARE EARTHS · 2023 · IF 4.9

Nano-effect enhanced cooperative luminescence of Yb3+ clusters in bulk materials

Daguang Li,Jiahao Cui,Yanhui Dong,Hao Cui,Dan Zhao,Weiping Qin

In order to improve the multi-ion cooperative transition, we proposed and exploited a novel nanoscale effect, namely the nanoshell effect in bulk materials. Based on the effect, an optimal material structure was designed by coating the surfaces of CaF 2 :Yb 3+ micron size particles with ZrO 2 . An about 2 times higher intensity of cooperative luminescence is observed upon laser excitation at 980 nm. Dynamical analysis exhibits that the novel effect plays a key role in improving the performance of cooperative transitions. Our results also suggest that the nanoshell effect in bulk materials is likely to be significant in some special cases, which have not been reported yet in the literature.

CAS / MDL: 7789-75-5 13760-80-0

研究领域: 材料科学 · 光学

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Light-Science & Applications · 2014 ·Vol. 3 ·期 8 ·e193 · IF 8.476

Multi-ion cooperative processes in Yb3+ clusters

Qin Wei-Ping,Liu Zhen-Yu,Sin Chol-Nam,Wu Chang-Feng,Qin Guan-Shi,Chen Zhe,Zheng Ke-Zhi

Cooperative luminescence (CL) occurs in spectral regions in which single ions do not have energy levels. It was first observed more than 40 years ago, and all results reported so far are from a pair of ions. In this work, upconverted CL of three Yb 3+ ions was observed in the ultraviolet (UV) region under near-infrared (NIR) excitation. The UV CL intensity showed a cubic dependence on the NIR pump power, whereas the luminescence lifetime was nearly one-third the luminescence lifetime of single Yb 3+ ions. The triplet CL (TCL) has a clear spectral structure, in which most emission peaks are consistent with the self-convoluted spectra from single Yb 3+ ions. Blue shifts were observed for certain peaks, indicating complex interactions among the excited Yb 3+ ions. The probability of the TCL process versus the average distances among three Yb 3+ ions was derived via the first- and second-order corrections to the wave functions of lanthanide ions, indicating that the formation of Yb 3+ clusters containing closely spaced ions favors the occurrence of the multi-ion interaction processes. Furthermore, the cooperative sensitization of one Gd 3+ ion by four excited Yb 3+ ions (Yb 3+ -tetramer) was demonstrated experimentally, which exhibited a novel upconversion mechanism—cluster sensitization. Our results are intriguing for further exploring quantum transitions that simultaneously involve multiple ions.

研究领域: 光学材料 · 稀土发光 · 量子光学 · 纳米光子学 · 固体发光

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Nano-effect enhanced cooperative luminescence of Yb3+ clusters in bulk materials

Multi-ion cooperative processes in Yb3+ clusters