Quantum cutting is an attractive optical phenomenon where one high-energy photon is converted into two low-energy photons, resulting in photoluminescence quantum yields (PLQYs) above 100%. In this report, we demonstrate a novel approach to enhance the quantum cutting energy transfer from an all-inorganic perovskite (CsPbCl₃) to ytterbium (Yb³⁺) and erbium (Er³⁺) ions as near-infrared (NIR) emitters by using the highly orientated crystalline film. Yb³⁺ ions are fixed in the neighborhood of the CsPbCl₃ lattice by preparing a one-to-one layer arrangement consisting of quasi-2D CsPbCl₃ perovskite and Yb³⁺ layers. The successful preparation of layer arrangements resulted in the highly sensitized luminescence of Yb³⁺ by CsPbCl₃ with NIR PLQYs exceeding 130%, which is attributed to quantum cutting. In addition, Er³⁺ luminescence at 1540 nm is acquired by the co-existence of Er³⁺ with Yb³⁺ in a layer, which is a result of the intralayer metal-to-metal energy transfer from Yb³⁺ activated by CsPbCl₃ via the interlayer quantum cutting process. The PLQY of Er³⁺ luminescence reaches to 12.6%, which is the highest value ever observed for Er³⁺ compounds, resulting from the efficient interlayer quantum cutting process over 100% and the following intralayer resonance metal to metal energy transfer with the efficiency over 80%.

中文翻译：

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层状钙钛矿薄膜中量子切割诱导的Yb3 +和Er3 +的近红外发光

量子切割是一种引人注目的光学现象，其中一个高能光子转换为两个低能光子，导致光致发光量子产率（PLQYs）超过100％。在本报告中，我们展示了一种新颖的方法来增强量子切割能量从全无机钙钛矿（CsPbCl ₃）到y （Yb ³⁺）和（Er ³⁺）离子作为近红外（NIR）发射体的传递，使用高度取向的结晶膜。通过制备由准2D CsPbCl ₃钙钛矿和Yb ³⁺组成的一对一层结构，将Yb ³⁺离子固定在CsPbCl ₃晶格附近。层。层排列的成功制备导致CsPbCl ₃对Yb ³⁺的高敏发光，其中NIR PLQYs超过130％，这归因于量子切割。另外，铒³⁺在1540nm处的发光是由铒的共存获取³⁺有Yb ³⁺中的层，这是由镱层内的金属对金属的能量转移的结果³⁺通过CsPbCl激活₃通过层间量子切割工艺。Er ³⁺发光的PLQY达到12.6％，这是Er ^3+的有史以来的最高值 这种化合物是由高效的层间量子切割工艺（超过100％）和随后的层间共振金属到金属能量转移（效率超过80％）产生的。