<br>具有超高热稳定性和可调谐发光的石榴石结构激活暖白光荧光粉 Ca3Al2Ge3O12: Dy3+、Eu3+,Inorganic Chemistry

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具有超高热稳定性和可调谐发光的石榴石结构激活暖白光荧光粉 Ca3Al2Ge3O12: Dy3+、Eu3+
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2024-01-02 , DOI: 10.1021/acs.inorgchem.3c03739
Lingbo Zhou _{1,

2} , Rujia Chen _{1,

2} , Xiliang Jiang _{1,

2} , Tianqing Zhang _{1,

2} , Xueming Shi _{1,

2} , Zhuang Leng _{1,

2} , Yimin Yang _{1,

2} , Zhipeng Zhang _{1,

2} , Chunyu Zuo _{1,

2} , Chun Li _{1,

2} , Weiling Yang _{1,

2} , Hai Lin _{1,

2} , Lina Liu _{1,

2} , Shasha Li _{1,

2} , Fanming Zeng _{1,

2} , Zhongmin Su ₃

Affiliation

采用高温固相法成功制备了一系列Ca ₃ Al ₂ Ge ₃ O ₁₂ : x Dy ³⁺ , y Eu ³⁺荧光粉。通过Rietveld精修和扫描电子显微镜研究了荧光粉的相和形貌。结果表明，该物相纯净，晶体结构为Ia 3̅ d空间群。在Ca ₃ Al ₂ Ge ₃ O ₁₂ : x Dy ³⁺荧光粉中，使用380 nm激发，荧光粉呈现蓝色（ ⁴ F _9/2 → ⁶ H _15/2 ）和黄色（ ⁴ F _9/2 → ⁶ H _{13 ） /2} ) 发射峰分别位于 481 和 581 nm。在Ca ₃ Al ₂ Ge ₃ O ₁₂ : x Dy ³⁺ , y Eu ³⁺荧光粉中，通过Dy ³⁺和Eu ³⁺的光谱重叠推断能量转移，并从动力学角度分析寿命衰减;最后，结合漫反射光谱和第一原理分析了荧光粉的带隙结构，并结合理论与实践阐述了能量传递机制和发光机制。通过调节Ca ₃ Al ₂ Ge ₃ O ₁₂ : 0.015Dy ³⁺ , y Eu ³⁺中y的范围可以实现从蓝白光到红光的转变。其中，当y ＝0.07时，荧光粉的暖白光CIE色品坐标为(0.3932，0.3203)，色温为3093K，合成暖白光。合成的暖白荧光粉的热稳定性为90.1% (423 K)，热传感因子为S _amax = 5.51 × 10 ^–4 K ^–1 (303 K) 和S _rmax = 0.0359% K ^–1 (303 K) ，实际量子效率为IQE = 52.48%。这些结果证明Ca ₃ Al ₂ Ge ₃ O ₁₂ :Dy ³⁺ , Eu ³⁺作为单组分暖w-LED器件具有良好的应用前景。

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Garnet Structure-Activated Warm White Light Phosphors Ca3Al2Ge3O12: Dy3+, Eu3+ with Ultrahigh Thermal Stability and Tunable Luminescence

A series of Ca₃Al₂Ge₃O₁₂: xDy³⁺, yEu³⁺ phosphors were successfully prepared by the high-temperature solid-phase method. The phase and morphology of the phosphors were studied by means of Rietveld refinement and scanning electron microscopy. The results show that the phase is pure, and the crystal structure is the Ia3̅d space group. In the Ca₃Al₂Ge₃O₁₂: xDy³⁺ phosphors, using 380 nm excitation, phosphors showed blue (⁴F_9/2 → ⁶H_15/2) and yellow (⁴F_9/2 → ⁶H_13/2) emission peaks at 481 and 581 nm, respectively. In Ca₃Al₂Ge₃O₁₂: xDy³⁺, yEu³⁺ phosphors, the energy transfer was inferred by the spectrum overlap of Dy³⁺ and Eu³⁺, and the lifetime attenuation was analyzed from the perspective of dynamics; finally, the band gap structure of the phosphors was analyzed by combining diffuse reflection spectra with the first principle, and the energy transfer mechanism and luminescence mechanism were elaborated by combining theory and practice. The transition from blue white light to red light can be achieved by tuning the range of y in Ca₃Al₂Ge₃O₁₂: 0.015Dy³⁺, yEu³⁺. Wherein, when y = 0.07, phosphors, the chromaticity coordinate of warm white CIE is (0.3932, 0.3203), the color temperature is 3093 K, and the warm white light is synthesized. The thermal stability of the synthesized warm white phosphors is 90.1% (423 K), the thermal sensing factors are S_amax = 5.51 × 10^–4 K^–1 (303 K) and S_rmax = 0.0359% K^–1 (303 K), and the actual quantum efficiency is IQE = 52.48%. These results prove that Ca₃Al₂Ge₃O₁₂: Dy³⁺, Eu³⁺ have good application prospects as single-component warm w-LED devices.

更新日期：2024-01-02

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