A modified chemical vapor deposition (CVD) technique is used to synthesize the color‐tunable siliconitride Sr_2‐1.5x‐yCe_xEu_ySi₅N₈ (x = 0.000‐0.016 and y = 0.000‐0.020) phosphors. In comparison with the conventional solid‐state method, the CVD approach successfully improved the crystallinity, particle size distribution, and photoluminescence through the enhanced gas‐solid reaction. Under blue excitation, Sr_1.98Eu_0.02Si₅N₈ exhibited a red emission band at 618 nm. The incorporation of Ce³⁺ ions increased the emission intensity of Eu²⁺ ions by approximately 10% owing to the enhanced absorption and dipole‐dipole energy transfer process from Ce³⁺ to Eu²⁺ ions. It resulted in a shift of the emission colors from yellow to red region. The external and internal quantum efficiencies of Sr_1.906Ce_0.06Eu_0.004Si₅N₈ were calculated as 54% and 70%, respectively. The activation energy of thermal stability for Sr_1.906Ce_0.06Eu_0.004Si₅N₈ was evaluated as 0.31 eV. A white LED with a color rendering index of 80 and a CCT of 4964 K was successfully fabricated with the present phosphors. The current research demonstrated a new series of Sr₂Si₅N₈:Ce³⁺, Eu²⁺ phosphors with color‐tunability for fabricating white LEDs with high color‐rendering index.

中文翻译：

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用于白色发光二极管的氮化硅磷光体的简便合成和光谱表征

改良的化学气相沉积（CVD）技术用于合成颜色可调的_氮化硅Sr _2-1.5xy Ce _x Eu _y Si ₅ N ₈（x = 0.000-0.016和y = 0.000-0.020）荧光粉。与传统的固态方法相比，CVD方法通过增强的气固反应成功地改善了结晶度，粒度分布和光致发光。在蓝色激发下，Sr _1.98 Eu _0.02 Si ₅ N ₈表现出在618 nm处的红色发射带。Ce ³⁺离子的掺入增加了Eu ²⁺的发射强度由于增强了从Ce ^3+离子到Eu ²⁺离子的吸收和偶极-偶极能量转移过程，因此离子的吸收率提高了约10％。这导致发射颜色从黄色区域变为红色区域。Sr _1.906 Ce _0.06 Eu _0.004 Si ₅ N ₈的外部和内部量子效率分别计算为54％和70％。Sr _1.906 Ce _0.06 Eu _0.004 Si ₅ N ₈的热稳定性活化能评估为0.31 eV。用本发明的荧光粉成功地制造了显色指数为80且CCT为4964K的白光LED。当前的研究表明，具有可调谐颜色的Sr ₂ Si ₅ N ₈：Ce ³⁺，Eu ^2+系列新荧光粉可用于制造具有高显色指数的白光LED。