首页|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

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

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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.
Ce3+,Cr3+co-doped garnet phosphors with yellow and near-infrared emission for white and near-IR dual-mode pc-LEDs
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.

garnetphosphorenergy transferCr3+near-infrared

吴其芃、唐嘉丽、韩跃、廖淑珍、张信果、廉世勋、张吉林

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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

Hunan Provincial Key Laboratory of Environmental Catalysis and Waste Recycling,College of Materials and Chemical Engineering,Hunan Institute of Engineering,Xiangtan 411104,China

Guangdong Provincial Key Laboratory of New Drug Screening,School of Pharmaceutical Sciences,Southern Medical University,Guangzhou 510515,China

garnet phosphor energy transfer Cr3+ near-infrared

2024

中国科学:材料科学(英文)

中国科学:材料科学(英文)

CSTPCD
ISSN:
年,卷(期):2024.67(12)