2-D Photo-Thermal Distribution and Structures of Flip-Chip Mini Light-Emitting Diodes by Microscopic Hyperspectral Imaging

Zhu, Lihong; Du, Wu-Jun; Huang, Jia-En; Chen, Huan-Ting; Gao, Yue; Gong, Honglin; Tong, Chang-Dong; Wu, Tingzhu; Guo, Weijie; Guo, Ziquan; Kuo, Hao‐Chung; Chen, Zhong; Lu, Yijun

doi:10.1109/tim.2023.3251405

Cited by 3 publications

(1 citation statement)

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“…Utilizing the new microscopic hyperspectral imaging (µ-HSI) technology, the two-dimensional spectral power distribution of the light-emitting surface can be obtained, and the temperature measurement of the LED surface can be combined with TSOP. Zhu et al [83] utilized µ-HSI for two-dimensional junction temperature measurement of LEDs. This technique enables simultaneous capture of two-dimensional images and spectral information from the LED, allowing for the detection of junction temperature in both two-dimensional and three-dimensional (3D) spaces.…”

Section: Temperature Sensitive Optical Parameters (Tsops)mentioning

confidence: 99%

LED Junction Temperature Measurement: From Steady State to Transient State

Zhao,

Gong,

Zhu

et al. 2024

Sensors

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In this review, we meticulously analyze and consolidate various techniques used for measuring the junction temperature of light-emitting diodes (LEDs) by examining recent advancements in the field as reported in the literature. We initiate our exploration by delineating the evolution of LED technology and underscore the criticality of junction temperature detection. Subsequently, we delve into two key facets of LED junction temperature assessment: steady-state and transient measurements. Beginning with an examination of innovations in steady-state junction temperature detection, we cover a spectrum of approaches ranging from traditional one-dimensional methods to more advanced three-dimensional techniques. These include micro-thermocouple, liquid crystal thermography (LCT), temperature sensitive optical parameters (TSOPs), and infrared (IR) thermography methods. We provide a comprehensive summary of the contributions made by researchers in this domain, while also elucidating the merits and demerits of each method. Transitioning to transient detection, we offer a detailed overview of various techniques such as the improved T3ster method, an enhanced one-dimensional continuous rectangular wave method (CRWM), and thermal reflection imaging. Additionally, we introduce novel methods leveraging high-speed camera technology and reflected light intensity (h-SCRLI), as well as micro high-speed transient imaging based on reflected light (μ_HSTI). Finally, we provide a critical appraisal of the advantages and limitations inherent in several transient detection methods and offer prognostications on future developments in this burgeoning field.

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Section: Temperature Sensitive Optical Parameters (Tsops)mentioning

confidence: 99%