Microsized Red Luminescent MgAl2O4:Mn4+ Single-Crystal Phosphor Grown in Molten Salt for White LEDs,Inorganic Chemistry

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Microsized Red Luminescent MgAl2O4:Mn4+ Single-Crystal Phosphor Grown in Molten Salt for White LEDs
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2020-11-27 , DOI: 10.1021/acs.inorgchem.0c03005
Zhaowu Wang ₁ , Haipeng Ji ₁ , Jian Xu ₂ , Xinghui Hou ₁ , Jumpei Ueda ₃ , Setsuhisa Tanabe ₃ , Shasha Yi ₁ , Ying Zhou ₁ , Deliang Chen _{1,

4}

Affiliation

A single-crystalline defect-less phosphor is desired for efficient luminescence of the therein doped optical activators. In this paper, microsized MgAl₂O₄:Mn⁴⁺ single-crystal phosphors with bright red luminescence were grown in molten LiCl salt at 950 °C, for application in blue LED pumped white lighting. By comparing the phosphor formation from various Mg²⁺- and Al³⁺-bearing sources, both the template-formation and the dissolution-diffusion processes were evidenced to account for the formation of the microsized MgAl₂O₄:Mn⁴⁺ crystallites. Using nano γ-Al₂O₃ as the Al³⁺-bearing precursor, the uniform MgAl₂O₄:Mn⁴⁺ microcrystallites with a {111} planes-exposed tetragonal bipyramid morphology were obtained. The photoluminescence property was studied at various temperatures, and Mg ↔ Al anti-site disorder induced luminescence broadening was discussed. The Mn⁴⁺²E_g → ⁴A_2g transition in MgAl₂O₄ shows a quite short luminescence wavelength peaking at 651 nm and ultrabroadband emission extending to 850 nm. The luminescence is relatively robust against thermal effect with relatively high thermal quenching temperature of 400 K and activation energy of 0.23 eV. Employing the red-emitting MgAl₂O₄:Mn⁴⁺ crystallites, blue LED pumped white lighting prototypes were fabricated which simulate the solar-like spectrum and show neutral to warm white.

中文翻译：

熔融盐中生长的微尺寸红色发光MgAl ₂ O ₄：Mn ⁴⁺单晶荧光体，用于白色LED

对于其中掺杂的光学活化剂的有效发光，需要单晶无缺陷的磷光体。本文在950°C的熔融LiCl盐溶液中生长了具有亮红色发光的MgAl ₂ O ₄：Mn ⁴⁺微尺寸单晶磷光体，用于蓝色LED泵浦白光照明。通过比较来自各种含Mg ²⁺和Al ³⁺的磷光体的形成，证明了模板的形成和溶解扩散过程都解释了MgAl ₂ O ₄：Mn ⁴⁺微晶的形成。采用纳米的γ-Al ₂ ö ₃随着Al^{获得了含3+的}前体，具有{111}面暴露的四方双锥体形态的均匀的MgAl ₂ O ₄：Mn ⁴⁺微晶。研究了在不同温度下的光致发光特性，并讨论了Mg↔Al反位错引起的荧光增宽。MgAl ₂ O _4中的Mn ⁴⁺² E _g → ⁴ A _2g转变显示出很短的发光波长峰值在651 nm，超宽带发射扩展到850 nm。该发光具有相对高的抗热效应能力，具有相对较高的400 K热淬火温度和0.23 eV的活化能。利用发出红光的MgAl ₂ O ₄：Mn ⁴⁺微晶，制造了蓝色LED抽运的白色照明原型，该原型模拟了类似太阳的光谱并显示出中性至暖白色。

更新日期：2020-12-21

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