黄光与近红外发射的Ce3+,Cr3+共掺杂石榴石荧光粉用于白光与近红外双模式pc-LEDs
Ce3+,Cr3+co-doped garnet phosphors with yellow and near-infrared emission for white and near-IR dual-mode pc-LEDs
吴其芃 1唐嘉丽 1韩跃 1廖淑珍 2张信果 3廉世勋 1张吉林1
作者信息
- 1. Key Laboratory of Light Energy Conversion Materials of Hunan Province College,Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research(Ministry of Education),College of Chemistry and Chemical Engineering,Hunan Normal University,Changsha 410081,China
- 2. Hunan Provincial Key Laboratory of Environmental Catalysis and Waste Recycling,College of Materials and Chemical Engineering,Hunan Institute of Engineering,Xiangtan 411104,China
- 3. Guangdong Provincial Key Laboratory of New Drug Screening,School of Pharmaceutical Sciences,Southern Medical University,Guangzhou 510515,China
- 折叠
摘要
具有可调近红外(NIR)发射的Cr3+激活荧光粉因其在多个领域的应用而备受关注.通过改变Cr3+的配位环境可改变其发射波长,但其宇称禁阻的d-d跃迁阻碍了吸收,降低了外量子效率(EQE).此外,较长的发射波长通常伴随着较差的热稳定性.为了解决这些问题,本文提出了通过敏化剂到Cr3+的能量传递提高近红外发射的EQE和热稳定性的策略.其中,选择合适的基质结构至关重要.本文以石榴石结构Ca2LuMgScSi3O12作为候选,来实现在蓝光激发下的高效宽带NIR发射.具体来说,Ca2LuMgScSi3O12∶Ce3+发射黄光,其内量子效率(IQE)和EQE分别高达94.6％和64.8％.利用从Ce3+到Cr3+的高效能量传递,Ca2LuMgScSi3O12∶Ce3+,Cr3+荧光粉具有从黄色到NIR的可调发光.值得注意的是,Ca2LuMgScSi3O12∶Ce3+,Cr3+的最高EQE为56.9％,远高于Cr3+单掺杂样品的EQE值.共掺杂荧光粉具有与Ce3+单掺杂荧光粉相当的热稳定性.所制备的原型pc-LED可同时发射宽带白光和近红外光,展示了其在类太阳光、食品分析和生物医学成像等方面的潜在应用.
Abstract
Cr3+-activated phosphors with adjustable near-infrared(NIR)emission have attracted considerable attention due to their diverse applications across various fields.While modifying the emission wavelength of Cr3+can be achieved by adjusting its coordination environment,the parity-forbidden d-d transition presents a challenge by limiting absorption and resulting in a low external quantum efficiency(EQE)in Cr3+-doped phosphors.Moreover,longer emission wavelengths often coincide with reduced thermal stability.To address these issues,energy transfer from a sensitizer to Cr3+has been proposed as a strategy to enhance both EQE and thermal stability of NIR emission.The selection of an appropriate host structure is crucial.In this study,a garnet structure,Ca2LuMgScSi3O12,was identified as a promising candidate for achieving efficient broadband NIR emission under blue light excitation.Specifically,Ca2LuMgScSi3O12∶Ce3+exhibited a yellow emission with exceptional internal quantum efficiency and EQE of up to 94.6％and 64.8％,respectively.By leveraging efficient energy transfer from Ce3+to Cr3+,the Ca2LuMgScSi3-O12∶Ce3+,Cr3+phosphors exhibited tunable yellow to NIR emission.Notable,the highest EQE recorded for Ca2LuMgScSi3O12∶Ce3+,Cr3+was 56.9％,significantly surpass-ing that of the Cr3+single-doped counterpart.Furthermore,the co-doped phosphor demonstrated thermal stability com-parable to that of Ce3+single-doped phosphor.Of particular significance,the developed prototype pc-LED emitted a com-bination of broadband white and NIR light,demonstrating potential applications in solar-like lighting,food analysis,and biomedical imaging.
关键词
garnet/phosphor/energy transfer/Cr3+/near-infraredKey words
garnet/phosphor/energy transfer/Cr3+/near-infrared引用本文复制引用
出版年
2024
NETL
NSTL
万方数据