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Finding an efficient far-red-emitting CaMg2La2W2O12:Mn4+ phosphor toward indoor plant cultivation LED lighting
Materials Today Chemistry ( IF 6.7 ) Pub Date : 2021-07-15 , DOI: 10.1016/j.mtchem.2021.100512
Nan Ma 1 , Wei Li 1 , Balaji Devakumar 2 , Zongjie Zhang 1 , Xiaoyong Huang 1
Affiliation  

The development of high-brightness far-red-emitting phosphors with emission wavelength within 650–750 nm is of great significance for indoor plant cultivation light-emitting diode (LED) lighting. Herein, we demonstrate a novel efficient far-red-emitting phosphors CaMg2La2W2O12:Mn4+ (abbreviated as CMLW:Mn4+) toward application in plant cultivation LEDs. Interestingly, the CMLW:Mn4+ phosphors show a broad excitation band in the 250–600 nm spectral range with two peaks at 352 and 479 nm, indicating they could be efficiently excited by near-ultraviolet and blue light. Under 352 nm excitation, the CMLW:Mn4+ phosphors exhibit an intense far-red emission band in the wavelength range of 650–800 nm peaking at 708 nm, corresponding to the 2Eg → 4A2g transition of Mn4+ ions. Mn4+ doping concentration-dependent luminescence properties are studied in detail, and the concentration quenching mechanism is also investigated. Particularly, the internal quantum efficiency of CMLW:Mn4+ phosphors reaches as high as 44%, and their PL spectra match well with the absorption spectrum of phytochrome PFR (PFR stands for far-red-absorbing form of phytochrome). Furthermore, a prototype LED device is fabricated by coating the as-prepared CMLW:0.8%Mn4+ phosphors on a 460 nm blue LED chip, which produces bright far-red emissions upon 20–300 mA driving currents. This work reveals that the newly discovered far-red-emitting CMLW:Mn4+ phosphors hold great potential for application in indoor plant cultivation.



中文翻译:

寻找一种高效的远红光发射 CaMg 2 La 2 W 2 O 12 :Mn 4+荧光粉用于室内植物栽培 LED 照明

开发发射波长在 650-750 nm 范围内的高亮度远红光荧光粉对于室内植物栽培发光二极管(LED)照明具有重要意义。在此,我们展示了一种新型高效远红光荧光粉 CaMg 2 La 2 W 2 O 12 :Mn 4+(缩写为 CMLW:Mn 4+)在植物栽培 LED 中的应用。有趣的是,CMLW:Mn 4+荧光粉在 250-600 nm 光谱范围内显示出宽的激发带,在 352 和 479 nm 处有两个峰,表明它们可以被近紫外光和蓝光有效激发。在 352 nm 激发下,CMLW:Mn 4+磷光体在 650-800 nm 的波长范围内表现出强烈的远红色发射带,在 708 nm 处达到峰值,对应于Mn 4+离子的2 E g  →  4 A 2g跃迁。详细研究了Mn 4+掺杂浓度依赖的发光特性,并研究了浓度猝灭机制。特别是CMLW:Mn 4+荧光粉的内量子效率高达44%,其PL光谱与光敏色素P FR (P FR代表光敏色素的远红吸收形式)。此外,通过在 460 nm 蓝色 LED 芯片上涂覆所制备的 CMLW:0.8%Mn 4+磷光体来制造原型 LED 器件,该芯片在 20-300 mA 驱动电流下产生明亮的远红光发射。这项工作表明,新发现的远红光 CMLW:Mn 4+荧光粉在室内植物栽培中具有巨大的应用潜力。

更新日期:2021-07-16
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