Liu Jiuhui, Zhong Juan, Zhong Zhaoyin, Lu Haifeng
School of Pharmacy, Youjiang Medical University for Nationalities, Baise, Guangxi, China.
Luminescence. 2025 Aug;40(8):e70285. doi: 10.1002/bio.70285.
The extension of near-infrared (NIR) emission beyond the conventional 700- to 900-nm range is crucial for advancing next-generation NIR phosphor-converted light-emitting diodes (NIR pc-LEDs). In this regard, co-doping strategies involving Yb have emerged as a promising approach to achieve broader spectral coverage with improved performance. Herein, a series of LiCsSrBPO: Cr, Yb co-doped phosphors are developed for the first time. Upon 450-nm excitation, the optimal LCSBPO: 0.1Cr, 0.02Yb phosphor delivers intense emission covering 900-1150 nm, which originated from the Stark-split F → F transitions of Yb. Co-doping results in a remarkable 61-fold increase in Yb emission compared to mono-doped Yb and a three-fold enhancement in overall luminescence relative to LCSBPO: 0.1Cr. Specifically, the internal quantum efficiency (IQE) improves from 33.7% to 50.6%. Despite the poor luminous thermal stability at 120°C (39.5%), the distinct thermal responses of Cr and Yb emissions enable ratiometric temperature sensing with a high relative sensitivity (S) of 1.93% K at 30°C. Additionally, an NIR pc-LED fabricated by integrating LCSBPO: 0.1Cr, 0.02Yb with a 450-nm blue LED demonstrates promising practical applications in night vision imaging and non-destructive analysis.
将近红外（NIR）发射扩展到传统的700至900纳米范围之外对于推进下一代近红外磷光体转换发光二极管（NIR pc-LED）至关重要。在这方面，涉及镱（Yb）的共掺杂策略已成为一种有前景的方法，可实现更宽的光谱覆盖范围并提高性能。在此，首次开发了一系列LiCsSrBPO：Cr、Yb共掺杂磷光体。在450纳米激发下，最佳的LCSBPO：0.1Cr、0.02Yb磷光体发出覆盖900至1150纳米的强烈发射，这源于Yb的斯塔克分裂F→F跃迁。与单掺杂Yb相比，共掺杂使Yb发射显著增加61倍，相对于LCSBPO：0.1Cr，整体发光增强了三倍。具体而言，内量子效率（IQE）从33.7%提高到50.6%。尽管在120°C时发光热稳定性较差（39.5%），但Cr和Yb发射的不同热响应使得在30°C时能够进行具有1.93% K的高相对灵敏度（S）的比率温度传感。此外，通过将LCSBPO：0.1Cr、0.02Yb与450纳米蓝色LED集成制造的NIR pc-LED在夜视成像和无损分析中展示了有前景的实际应用。
