From lab to lamp: Understanding downconverter degradation in LED packages
From lab to lamp: Understanding downconverter degradation in LED packages
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DOI：
10.1063/5.0122735
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发表时间：
2022-11
影响因子：
3.2
通讯作者：
Shruti Hariyani;Jakoah Brgoch;F. García-Santamaría;S. Sista;J. Murphy;A. Setlur
中科院分区：
文献类型：
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作者：
Shruti Hariyani;Jakoah Brgoch;F. García-Santamaría;S. Sista;J. Murphy;A. Setlur
降频转换器（主要是无机磷光体）是基于白色固态LED的照明和液晶显示器背光源中的关键组件。研究工作已经导致对下变频器的吸收、光致发光和效率作为组成、结构和处理条件的函数的基本理解。然而，相当少的工作集中在荧光粉的可靠性，一旦他们被纳入LED封装。解决这些问题通常是新材料商业化之前的最后一步，但文献中很少讨论评估和减轻材料失效所需的大量资源和时间。在这方面，我们讨论了进行下变频器可靠性测试的必要性，以及加速、筛选和了解下变频器故障模式的可能性。我们的重点突出了故障的机制，并讨论了这如何影响材料的选择和不同的LED封装的设计。我们还强调了加速可靠性测试协议的潜力，并注意到第一原理计算和数据驱动模型在为下变频器可靠性的不同方面建立组合处理趋势方面可能发挥的潜在作用。最后，我们总结了可能提高降频转换器可靠性的研究方向，并强调了评估材料（化学）稳定性的重要性，其中多个制造和加工步骤可以决定系统性能。
Downconverters, primarily inorganic phosphors, are critical components in white solid-state LED-based lighting and liquid crystal display backlights. Research efforts have led to a fundamental understanding of a downconverter's absorption, photoluminescence, and efficiency as a function of composition, structure, and processing conditions. However, considerably less work has focused on the reliability of phosphors once they are incorporated into LED packages. Solving these issues is often the final step before the commercialization of new materials, but the significant resources and time required to evaluate and mitigate materials failure are rarely discussed in the literature. In this Perspective, we discuss the need for conducting downconverter reliability testing and the potential of accelerating, screening, and understanding downconverter failure modes. Our focus highlights the mechanisms of failure and discusses how this influences materials selection and the design of different LED packages. We also stress the potential for accelerated reliability testing protocols and note the potential role first-principles calculations and data-driven models could play in establishing the compositional-processing trends for different aspects of downconverter reliability. We close with possible research directions that could improve downconverter reliability and emphasize the importance of assessing a material's (chemical) stability where multiple manufacturing and processing steps can dictate system performance.