Efficient, Stable, and Ultra-Broadband Near-Infrared Garnet Phosphors for Miniaturized Optical Applications,Advanced Optical Materials

当前位置： X-MOL 学术 › Adv. Opt. Mater. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Efficient, Stable, and Ultra-Broadband Near-Infrared Garnet Phosphors for Miniaturized Optical Applications
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2022-05-31 , DOI: 10.1002/adom.202200676
Misgana U. Dumesso ₁ , Wenge Xiao ₁ , Guojun Zheng ₁ , Endale T. Basore ₁ , Mingxue Tang ₂ , Xiaofeng Liu ₃ , Jianrong Qiu _{1,

4}

Affiliation

Broadband near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) are recently regarded as the next-generation smart light sources for miniaturized optical applications. However, their way to practical applications is largely obstructed by the lack of efficient NIR phosphors with photoluminescence (PL) spectrum covering the whole range of 700–1100 nm. Here, an ultra-broadband NIR phosphor is designed by rationally constructing a Cr³⁺ → Yb³⁺ energy transfer system in a garnet crystal Lu₂CaMg₂Ge₃O₁₂ (LCMG). The disordering of the neighboring cations of LCMG is exploited for removing the inversion symmetry of octahedrally coordinated Cr³⁺ to promote its parity-forbidden d–d transition probability; meanwhile, efficient Cr³⁺Yb³⁺ energy transfer is leveraged not only to enrich the short-wave NIR PL in 950–1100 nm, but also to greatly improve the internal quantum efficiency (QE) (from 57.8% to 84.2%) as well as thermal stability. The resulting high external QE (35.6%) enables the demonstration of ultra-broadband NIR pc-LED with a record NIR output power of 93.2 mW (350 mA), which promises better performance of pc-LEDs in non-visible optical applications. This work provides a possible paradigm for developing ultra-broadband NIR phosphors activated by transition metal ions.

中文翻译：

用于小型化光学应用的高效、稳定和超宽带近红外石榴石荧光粉

宽带近红外 (NIR) 荧光粉转换发光二极管 (pc-LED) 最近被认为是用于小型化光学应用的下一代智能光源。然而，由于缺乏具有覆盖 700-1100 nm 整个范围的光致发光 (PL) 光谱的高效 NIR 荧光粉，它们的实际应用之路在很大程度上受到阻碍。_{在此，通过在石榴石晶体Lu 2} CaMg ₂ Ge ₃ O ₁₂ (LCMG)中合理构建Cr ³⁺ → Yb ³⁺能量转移体系，设计了超宽带近红外荧光粉。利用 LCMG 相邻阳离子的无序性来消除八面体配位 Cr ^{3+的反转对称性}提升其禁止奇偶性的d - d转换概率；同时，利用高效的 Cr ³⁺ Yb ³⁺能量转移，不仅丰富了 950-1100 nm 的短波 NIR PL，还大大提高了内量子效率（QE）（从 57.8% 到 84.2%）以及热稳定性。由此产生的高外部 QE (35.6%) 能够演示超宽带 NIR pc-LED，其近红外输出功率达到创纪录的 93.2 mW (350 mA)，这保证了 pc-LED 在不可见光学应用中的更好性能。这项工作为开发由过渡金属离子激活的超宽带近红外荧光粉提供了可能的范例。

更新日期：2022-05-31

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南