化工新型材料

化工新型材料 ›› 2020, Vol. 48 ›› Issue (4) : 73-76.

新材料与新技术

白光荧光粉Ba₃Y₂B₆O₁₅∶Dy³⁺的制备及发光性能研究

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Preparation and luminescent property of Ba₃Y₂B₆O₁₅∶Dy³⁺ white phosphor

Qi Shimei¹, Zhou Weixin³, Zhao Wenyu², Liu Jun³

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Received
2018-12-04
Issue Date	Revised Date
2020-05-14	2018-12-04

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摘要

通过高温固相法制备白光荧光粉Ba₃Y₂B₆O₁₅∶Dy³⁺,并利用XRD和光致发光光谱分别对样品的晶体结构和发光性能进行表征。结果表明,Dy³⁺作为发光中心取代Y³⁺进入基质Ba₃Y₂B₆O₁₅的晶格中并未改变其晶体结构。样品的激发光谱是由Dy³⁺的f-f特征激发跃迁组成,主峰为353nm。样品的发射光谱由Dy³⁺的两个特征发射跃迁 ⁴F_9/2→⁶H_15/2(483nm)和 ⁴F_9/2→⁶H_13/2(575nm)组成;由于Dy³⁺主要处于高对称性的格位,Dy³⁺发射以磁偶极跃迁 ⁴F_9/2→⁶H_15/2为主。发生浓度淬灭的主要原因是Dy³⁺离子之间的双极子-双极子相互作用。样品Ba₃Y₂B₆O₁₅∶0.06Dy³⁺的发光强度最高,其CIE色坐标和相关色温分别为(0.3122,0.3676)和6282K,位于白光区域,接近于标准白光源D₆₅。随着温度的升高,由于热猝灭,样品的发光强度逐渐下降;当温度达到140℃时,样品的发光强度下降50%。基于Arrhenian公式计算,相对应的热活化能为0.3056eV,高于白光Na₃GdP₂O₈∶Dy³⁺。实验表明,单基质的Ba₃Y₂B₆O₁₅∶Dy³⁺可作为白光荧光粉应用于UV-LED器件中。

Abstract

Ba₃Y₂B₆O₁₅∶Dy³⁺ white phosphor was synthesized by a high-temperature solid-state reaction.XRD and photoluminescence spectrum were utilized to characterize its crystal structures and luminescent properties,respectively.Results indicated that Dy³⁺ions was as luminescence centers substitute forY³⁺ ions in the crystal lattice of Ba₃Y₂B₆O₁₅ without changing its crystal structure.The excitation spectrum presented the 4f-4f characteristic transitions of Dy³⁺ with the main peak at 353nm.The characteristic emission consisted of ⁴F_9/2→⁶H_15/2(483nm) and ⁴F_9/2→⁶H_13/2(575nm) transitions of Dy³⁺.The former was dominant due to high symmetry of Dy³⁺.The concentration quenching between Dy³⁺ ions was demonstrated to be dipole-dipole interaction.The optimum phosphor Ba₃Y₂B₆O₁₅∶0.06Dy³⁺ showed a white-light emission with the color coordinate of (0.3122,0.3676) and correlated color temperature (CCT) of 6282K,closing to the CIE Illuminant D₆₅.The emission intensity decreased with the increasing temperature due to the thermal quenching.The emission intensity remained about 50% compared with that at 28℃.The thermal activation energy was 0.3056eV,higher than that of Na₃GdP₂O₈∶Dy³⁺.The Ba₃Y₂B₆O₁₅∶Dy³⁺ was a promising white phosphor for the n-UV excited white-LEDs.

关键词

荧光粉 / 光致发光 / Ba₃Y₂B₆O₁₅∶Dy³⁺

Key words

phosphor / photoluminescence / Ba₃Y₂B₆O₁₅∶Dy³⁺

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白光荧光粉Ba₃Y₂B₆O₁₅∶Dy³⁺的制备及发光性能研究[J]. 化工新型材料, 2020, 48(4): 73-76 DOI:

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