Non-Rare-Earth BaMgAl10–2xO17:xMn4+,xMg2+: A Narrow-Band Red Phosphor for Use as a High-Power Warm w-LED

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• 作者：Bo Wang ; Hang Lin ; Feng Huang ; Ju Xu ; Hui Chen ; Zebin Lin ; Yuansheng Wang
• 刊名：Chemistry of Materials
• 出版年：2016
• 出版时间：May 24, 2016
• 年：2016
• 卷：28
• 期：10
• 页码：3515-3524
• 全文大小：907K
• 年卷期：0
• ISSN：1520-5002

文摘

Owing to its low cost and admirable luminescent characteristics for use in warm white-light-emitting diode (w-LED) applications, the non-rare-earth Mn⁴⁺-activated red phosphor has emerged as a potent competitor of commercial Eu²⁺-doped nitrides in recent years. In this work, the novel red-emitting phosphor BaMgAl_10–2xO₁₇:xMn⁴⁺,xMg²⁺ is successfully synthesized, which exhibits bright and narrow-band luminescence peaking at 660 nm with a full width at half-maximum of merely ∼30 nm upon blue light excitation. The unique structural feature of BMA, i.e., alternating arrangements of Mn⁴⁺-doped MgAl₁₀O₁₆/undoped BaO layers in the z direction and Mn⁴⁺-doped [AlO₆]/undoped [AlO₄] groups in the x–y plane, favors efficient Mn⁴⁺ luminescence by reducing nonradiative energy loss channels. Unlike previously reported hosts, BMA accommodates Mg²⁺ in the lattice without destabilizing the crystal structure. Remarkably, partitioning Mg²⁺ in the host not only greatly enhances Mn⁴⁺ luminescence by 1.84-fold but also retards the concentration quenching effect induced by Mn⁴⁺ dipole–dipole interactions owing to the reduced number of Mn⁴⁺–Mn⁴⁺–O^2– pairs. Spectroscopy demonstrates that the luminescence of optimized BMA:0.02Mn⁴⁺,0.02Mg²⁺ exhibits a high color purity of 98.3%, good color stability against heat, and excellent resistance to thermal impact. When incorporating BMA:0.02Mn⁴⁺,0.02Mg²⁺ and YAG:Ce³⁺ phosphors into an oxide glass matrix at various ratios and then coupling the phosphor-in-glass color converters using a blue chip, the chromaticity parameters of the fabricated w-LED are well-tuned, with the correlated color temperature decreasing from 6608 to 3622 K and the color rendering index increasing from 68.4 to 86.0, meeting the requirements for in-door lighting use.