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Rare-earth-free zinc aluminium borate white phosphors for LED lighting
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2020-07-27 , DOI: 10.1039/d0tc02196b P. Gaffuri 1, 2, 3, 4, 5 , M. Salaün 1, 2, 3, 4, 5 , I. Gautier-Luneau 1, 2, 3, 4, 5 , G. Chadeyron 5, 6, 7, 8 , A. Potdevin 5, 6, 7, 8 , L. Rapenne 4, 5, 9, 10 , E. Appert 4, 5, 9, 10 , V. Consonni 4, 5, 9, 10 , A. Ibanez 1, 2, 3, 4, 5
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2020-07-27 , DOI: 10.1039/d0tc02196b P. Gaffuri 1, 2, 3, 4, 5 , M. Salaün 1, 2, 3, 4, 5 , I. Gautier-Luneau 1, 2, 3, 4, 5 , G. Chadeyron 5, 6, 7, 8 , A. Potdevin 5, 6, 7, 8 , L. Rapenne 4, 5, 9, 10 , E. Appert 4, 5, 9, 10 , V. Consonni 4, 5, 9, 10 , A. Ibanez 1, 2, 3, 4, 5
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The use of rare-earth elements (Y, Ce, Eu…) in commercial phosphor-converted white light-emitting diodes (pc-WLEDs) raises environmental and geopolitical concerns. Lanthanide-free white emitting phosphors based on amorphous yttrium aluminium borate (YAB) have previously been synthesized by the polymeric precursor (PP) method, showing high internal quantum yields (iQY) and a broad emission band in the visible range. However, yttrium has still been largely present in the amorphous YAB matrix. Here we synthesize zinc aluminium borate (ZAB) powder by the PP method, a novel family of rare-earth-free phosphors producing broad and intense photoluminescence emissions when excited by near-UV from 300 to 400 nm, with high iQYs up to 60%. The photoluminescence band is easily tuneable in the visible range of the electromagnetic spectrum, from warm- to cold-white emissions by adjusting either the precursor ratio or the calcination temperature used to prepare the ZAB powders. Finally, we report spectroscopic arguments that reinforce the hypothesis of the molecular origin of the photoluminescence in ZAB phosphors. Our results demonstrate the essential role of the composition (Al/B ratio) and thermal treatment in the transformation and trapping of carbonaceous species (i.e. black carbon or luminescent molecular species) in an amorphous ZAB matrix. This efficient family of phosphors only composed of abundant and non-toxic elements opens the way for the integration of rare-earth-free single phosphors synthesized by wet chemistry into WLED lighting devices.
中文翻译：
用于LED照明的无稀土硼酸铝锌白色荧光粉
在商业荧光粉转换的白色发光二极管（pc-WLED）中使用稀土元素（Y，Ce，Eu…）引起了环境和地缘政治的关注。先前已经通过聚合物前体（PP）方法合成了基于非晶硼酸铝钇（YAB）的无镧系元素的白色发射磷光体，显示出高的内部量子产率（iQY）和可见光范围内的宽发射带。但是，钇仍主要存在于无定形的YAB基质中。在这里，我们通过PP方法合成硼酸锌铝（ZAB）粉末，这是一种新型的稀土无磷荧光粉，当在300至400 nm的近紫外线下激发时，产生宽而强烈的光致发光发射，iQY高达60％ 。光致发光带很容易在电磁光谱的可见光范围内调节，通过调整制备ZAB粉末所用的前体比率或煅烧温度，可以从暖白到冷白排放。最后，我们报告了光谱学上的论点，这些论点加强了ZAB荧光粉中光致发光分子起源的假设。我们的结果证明了成分（Al / B比）和热处理在碳质物质的转化和捕集中的重要作用（即在无定形基质ZAB炭黑或发光分子种类）。这种仅由大量无毒元素组成的高效磷光体家族，为将通过湿化学合成的无稀土单一磷光体整合到WLED照明设备中开辟了道路。
更新日期：2020-09-03
中文翻译：
用于LED照明的无稀土硼酸铝锌白色荧光粉
在商业荧光粉转换的白色发光二极管（pc-WLED）中使用稀土元素（Y，Ce，Eu…）引起了环境和地缘政治的关注。先前已经通过聚合物前体（PP）方法合成了基于非晶硼酸铝钇（YAB）的无镧系元素的白色发射磷光体，显示出高的内部量子产率（iQY）和可见光范围内的宽发射带。但是，钇仍主要存在于无定形的YAB基质中。在这里，我们通过PP方法合成硼酸锌铝（ZAB）粉末，这是一种新型的稀土无磷荧光粉，当在300至400 nm的近紫外线下激发时，产生宽而强烈的光致发光发射，iQY高达60％ 。光致发光带很容易在电磁光谱的可见光范围内调节，通过调整制备ZAB粉末所用的前体比率或煅烧温度，可以从暖白到冷白排放。最后，我们报告了光谱学上的论点，这些论点加强了ZAB荧光粉中光致发光分子起源的假设。我们的结果证明了成分（Al / B比）和热处理在碳质物质的转化和捕集中的重要作用（即在无定形基质ZAB炭黑或发光分子种类）。这种仅由大量无毒元素组成的高效磷光体家族，为将通过湿化学合成的无稀土单一磷光体整合到WLED照明设备中开辟了道路。
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