Thermal design of rectangular microscale inorganic light-emitting diodes
Thermal design of rectangular microscale inorganic light-emitting diodes
复制标题
矩形微型无机发光二极管的热设计
DOI：
10.1016/j.applthermaleng.2017.05.020
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发表时间：
2017-07-25
影响因子：
6.4
通讯作者：
Song, Jizhou
中科院分区：
文献类型：
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作者：
Cui, Yun;Li, Yuhang;Song, Jizhou
近年来发展起来的微尺度无机发光二极管（mu-ILED）由于其在光遗传学等生物集成应用中的潜在应用而引起了人们的广泛关注。了解mu-ILED的热特性至关重要，因为过度加热可能会显着降低性能。本文建立了一个基于傅里叶余弦变换的三维解析模型，用于研究矩形多晶发光二极管的热特性。分析预测与有限元分析吻合良好。一个单一μ-ε的归一化温升的标度律是根据四个无量纲参数建立的：归一化的形状因子γ = B/a，条（LED）上的归一化的μ层厚度（H）= H-LED/a，以及chi（1）= k（m）H（m）/（k（s）a）和chi（2）= k（s）H（B）/（k（B）a），其中a和B是μ层的半长，k和H分别是热导率和厚度，下标LED、m、B和s分别表示μ-晶体管、金属层、封装层和衬底。系统地研究了这些无量纲参数对归一化温升的影响。然后用叠加法解析地得到了矩形μ阵的温升。这些结果提供了设计准则，以尽量减少不利的热响应的矩形多ILED。(C)2017爱思唯尔有限公司版权所有
The recently developed microscale inorganic light-emitting diodes (mu-ILEDs) have attracted much attention due to their potential use in biointegrated applications such as optogenetics. It is critical to understand the thermal properties of mu-ILEDs since excessive heating may reduce the performance significantly. A three-dimensional analytical model based on the Fourier Cosine transform is developed to study the thermal properties of rectangular mu-ILEDs in this paper. The analytical prediction agrees well with finite element analysis. A scaling law for the normalized temperature increase of a single mu-ILED is established in terms of four non-dimensional parameters: the normalized shape factor gamma = b/a, the normalized mu-ILED thickness (H) over bar (LED) = H-LED/a, and chi(1) = k(m)H(m)/(k(s)a) and chi(2) = k(s)H(B)/(k(B)a) , where a and b are the half-lengths of the mu-ILED, k and H are the thermal conductivity and the thickness with the subscripts LED, m, B and s for the mu-ILED, metal layer, encapsulation layer and substrate, respectively. The influences of these non-dimensional parameters on the normalized temperature increase are systematically investigated. The temperature increase for rectangular mu-ILED array is then obtained analytically by the method of superposition. These results provide design guidelines to minimize the adverse thermal response of rectangular mu-ILEDs. (C) 2017 Elsevier Ltd. All rights reserved.