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首页> 外文期刊>Dyes and Pigments >A far-red-emitting NaMgLaTeO6:Mn4+ phosphor with perovskite structure for indoor plant growth
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A far-red-emitting NaMgLaTeO6:Mn4+ phosphor with perovskite structure for indoor plant growth

机译：一个远红发射Namglateo6：MN4 +磷光体，具有室内植物生长的钙钛矿结构

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In this article, we report a far-red-emitting phosphor NaMgLaTeO6:Mn4+ with the perovskite structure synthesized by a high-temperature solid-state reaction method. The XRD patterns for NaMgLaTeO6:Mn4+ and the refinement for the representative NaMgLaTeO6:0.006Mn(4+) confirm the purity of the as-prepared samples. The emission spectrum of optimal NaMgLaTeO6:0.02Mn(4+) covers a series of narrow lines in the range from 16667 to 12500 cm(-1) (600-800 nm), peaking at 14225 cm(-1) (703 nm) due to the Mn4+ spin- and parity-forbidden E-2(8)-(4)A(2g) transition. The excitation spectrum monitored at 703 nm has a broad excitation band with the range from 40000 to 16667 cm(-1) (250-600 nm) centered at 28571 (350 nm) and 21505 cm(-1) (465 nm), which matches well with UV or blue chips, respectively. The band can be decomposed into four Gaussian bands centered at 31646 cm(-1) (316 nm), 28169 cm(-1) (355 nm), 24631 cm-1 (O-4(6) nm) and 20921 cm(-1) (478 nm), corresponding to the O-2(-)-Mn-4 charge-transfer and the Mn4+ T-4(1g)-(4)A(2g),T-2(2g)-(4)A(2g) and T-4(2g)-(4)A(2g) transitions, respectively. The optimal concentration x of Mn4+ in NaMgLaTeO6:xMn4+ was examined to be 0.02 with a corresponding quantum yield of 57.43% under 365 nm excitation, beyond which concentration quenching occurred. The energy transfer mechanism between Mn4+ ions was determined to be a dipole-dipole interaction by analyzing the relationship between concentration and emission intensity. The temperature-dependent luminescence intensity decreased to about 75% at 150 degrees C of its original value at room temperature, illustrating its thermal luminescence stability of this phosphor. Moreover, a crystal field analysis for the NaMgLaTeO6:0.02Mn(4+) representative was conducted. By using the decay lifetimes and time-resolved emission spectra, we discriminated the different occupancies of Mn4+ not only at the Te6+ but also at the Mg2+ sites in the crystal structure. More importantly, the emission band matched well with the absorption band of phytochrome Pfr, which implies the phosphors can be potentially applied in light-emitting diodes (LEDs) for regulating the growth of plants.
机译：在本文中，我们通过高温固态反应方法合成的钙钛矿结构报告了一个远红发光磷酸盐盐液6：Mn4 +。 Namglateo6：Mn4 +的XRD图案和代表性Namglateo6：0.006mn（4+）的细化证实了制备的样品的纯度。最佳Namglateo6：0.02Mn（4+）的发射光谱覆盖一系列窄线，范围为16667至12500cm（-1）（600-800nm），达到14225cm（-1）（703nm）由于MN4 +旋转和奇偶校验禁用的E-2（8） - ＆（4）A（2g）过渡。在703nm处监测的激励光谱具有宽激励带，其范围为40000至16667cm（-1）（250-600nm），以28571（350nm）和21505cm（-1）（465nm）为中心，分别与UV或蓝筹股匹配。该带可以分解成以31646cm（-1）（316nm），28169cm（-1）（355nm），24631cm-1（O-4（6）Nm）和20921cm（ -1）（478nm），对应于O-2（ - ） - Mn-4电荷转移和Mn4 + T-4（1g）＆ --( 4）a（2g），t-2（2g） ＆lt ;( 4）A（2g）和T-4（2g）分别为（2g）的过渡。在NamGlateo6：XMN4 +中的Mn4 +中的最佳浓度x为0.02，相应的量子产率为365nm激发率为57.43％，超出其浓度猝灭。通过分析浓度和发射强度之间的关系，确定Mn4 +离子之间的能量转移机制是偶极偶极相互作用。在室温下，温度依赖性发光强度在其原始值的150摄氏度下降低至约75％，示出了该磷光体的热发光稳定性。此外，对Namglateo6：0.02mN（4+）代表进行了晶体场分析。通过使用衰减生命和时间分辨的发射光谱，我们不仅在TE6 +处鉴定了MN4 +的不同占用，而且在晶体结构中的Mg2 +位点处歧视MN4 +的不同占用。更重要的是，发射带与植物色度PFR的吸收带良好，这意味着磷光体可能潜在地应用于用于调节植物生长的发光二极管（LED）。

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