Highly efficient oxide-based red line emitters are still a bottleneck for smart white LEDs. In the present investigation, sequences of narrow band red emitting phosphors were synthesized via the conventional solid-state technique. The X-ray diffraction studies revealed that the as-synthesized phosphors were crystallized in the trigonal phase with the space group I4₁/a (88). Under 395 nm excitation, NaSrGd(MoO₄)₃:Eu³⁺ phosphors showed sharp red emission at about 616 nm because of the ⁵D₀ → ⁷F₂ transition (ED transition). Moreover, the internal quantum efficiency (IQE) was found to be 82%, and the thermal stability study showed that the NaSrGd_0.5Eu_0.5(MoO₄)₃ phosphor retains the emission intensity of about 71.5% of its initial room temperature intensity at 423 K. The red LEDs were designed for the NaSrGd_0.5Eu_0.5(MoO₄)₃ red phosphors with the NUV LED chip. White LED was also fabricated by conjugating the blue LED with yellow dye + red phosphor and the LED showed CCT (6823 K), CRI (74%), and CIE (0.306, 0.331). The Sm³⁺ and Eu³⁺ co-doped deep red phosphor was synthesized and studied in plant growth. The LED emission of Sm³⁺ and Eu³⁺ co-doped phosphor completely covers the absorption spectrum of Phytochrome Pr. All of these consequences revealed that the as-synthesized phosphor could be an efficient red emitting phosphor for warm white LEDs with application in plant growth research.

中文翻译：

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用于白色LED的高性能红色/深红色荧光粉

高效的基于氧化物的红线发射器仍然是智能白光LED的瓶颈。在本研究中，通过常规固态技术合成了窄带红色发光磷光体序列。X射线衍射研究表明，合成后的荧光粉在空间相为I 4 ₁ / a的三角相中结晶（88）。在395 nm激发下，由于⁵ D ₀ → ⁷ F ₂，NaSrGd（MoO ₄）₃：Eu ³⁺荧光粉在约616 nm处显示出尖锐的红色发射。过渡（ED过渡）。此外，发现内部量子效率（IQE）为82％，热稳定性研究表明，NaSrGd _0.5 Eu _0.5（MoO ₄）₃荧光粉在423的温度下保留了其初始室温强度的约71.5％的发射强度。 K.红色LED是为带有NUV LED芯片的NaSrGd _0.5 Eu _0.5（MoO ₄）₃红色荧光粉设计的。还通过将蓝色LED与黄色染料+红色磷光体共轭来制造白色LED，LED的色温显示为CCT（6823 K），CRI（74％）和CIE（0.306，0.331）。Sm ³⁺和Eu ³⁺合成了共掺杂的深红色荧光粉，并进行了植物生长研究。Sm ³⁺和Eu ³⁺共掺杂磷光体的LED发射完全覆盖了植物色素Pr的吸收光谱。所有这些结果表明，合成后的磷光体可能是用于暖白光LED的高效红色发光磷光体，并应用于植物生长研究中。