Heat dissipation performance of a high-brightness LED package assembly using high-thermal conductivity filler

Yung, Kam Chuen; Liem, H.; Choy, H. S.

doi:10.1364/ao.52.008484

Cited by 16 publications

(6 citation statements)

References 26 publications

(31 reference statements)

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“…Thus, managing the thermal effect is critical in extending the lifetime of a pc-WLED. Generally, the junction temperature of the LED die is considered an indicator of the thermal condition in both academia and industry 15–21 . However, the junction temperature of the LED die is not strongly correlated with the temperature in the phosphor layer.…”

Section: Introductionmentioning

confidence: 99%

Noncontact and instant detection of phosphor temperature in phosphor-converted white LEDs

Yang

Huang

Sun

et al. 2018

Sci Rep

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Phosphor-converted white light-emitting diodes (pc-WLEDs) have become a major light source in general lighting. To stabilize the photometric characteristics of pc-WLEDs, much effort has been made to manage the heat dissipation of the LED dies. The thermal problems of the phosphor parts, a critical reliability concern for pc-WLEDs, have recently attracted academic interest. This study proposed a practical approach for measuring phosphor temperature in an operating pc-WLED using a noncontact, instant detection method to remotely monitor the emission spectrum. Conventionally, an infrared camera or thermocouples have been used to measure temperature. An IR camera requires good calibration on the emissivity and is usually blocked by the lens or other components covered on the phosphors. Moreover, a thermocouple requires time to reach the thermal equivalence between the detector and the sample under testing, and this approach is destructive when used for inner detection. Our approach has advantages over the conventional methods because it is noninvasive, noncontact, and instant, and inner detection. The approach is also independent of the peak wavelength of pumping lights, the concentration and thickness of phosphor, and correlated color temperatures.

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Section: Introductionmentioning

confidence: 99%

Noncontact and instant detection of phosphor temperature in phosphor-converted white LEDs

Yang

Huang

Sun

et al. 2018

Sci Rep

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“…However, recent findings have shown that performance can be compromised by illumination variations caused by ineffective heat dissipation, especially considering that the emitted peak wavelength is highly dependent on the core temperature of the LED (9). With an increase in core temperature, the emitted peak wavelength will be a higher, less favorable wavelength for photosensitizer excitation of IRDye (LI-COR Biosciences) 700DX, which is commonly used as a preclinical PIT agent (7,10).…”

mentioning

confidence: 99%

A Standardized Light-Emitting Diode Device for Photoimmunotherapy

et al. 2014

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Antibody-based photodynamic therapy-photoimmunotherapy (PIT)-is an ideal modality to improve cancer treatment because of its selective and tumor-specific mode of therapy. Because the use of PIT for cancer treatment is continuing to be described, there is great need to characterize a standardized light source for PIT application. In this work, we designed and manufactured a light-emitting diode (LED)/PIT device and validated the technical feasibility, applicability, safety, and consistency of the system for cancer treatment. Methods: To outline the characteristics and photobiologic safety of the LED device, multiple optical measurements were performed in accordance with a photobiologic safety standard. A luciferase-transfected breast cancer cell line (2LMP-Luc) in combination with panitumumabIRDye 700DX (pan-IR700) was used to validate the in vitro and in vivo performance of our LED device. Results: Testing revealed the light source to be safe, easy to use, and independent of illumination and power output (mW cm −2 ) variations over time. For in vitro studies, an LED dose (2, 4, 6 J cm −2 )-dependent cytotoxicity was observed using propidium iodide exclusion and annexin V staining. Dosedependent blebbing was also observed during microscopic analysis. Bioluminescence signals of tumors treated with 0.3 mg of pan-IR700 and 50 J cm −2 decreased significantly (.80%) compared with signals of contralateral nontreated sites at 4 h and at 1 d after PIT. Conclusion: To our knowledge, a normalized and standardized LED device has not been explicitly described or developed. In this article, we introduce a standardized light source and validate its usability for PIT applications.

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“…The application of IR thermography can be seen for the thermal inspection of various types of LEDs, including chip on board (COB) [ 104 ], surface mounted devices (SMD) [ 105 ], and flip-chips [ 106 ]. This method is widely preferred for various thermal management-related problems in LEDs [ 107 , 108 , 109 , 110 , 111 , 112 ]. The basic principle of IR thermography is to capture electromagnetic radiation emitted from the surface of objects in the IR spectrum and monitor the corresponding 2D temperature maps.…”

Section: Optical Temperature Probing Methodsmentioning

confidence: 99%

A Critical Review on the Junction Temperature Measurement of Light Emitting Diodes

2022

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In the new age of illumination, light emitting diodes (LEDs) have been proven to be the most efficient alternative to conventional light sources. Yet, in comparison to other lighting systems, LEDs operate at low temperatures while junction temperature (Tj) is is among the main factors dictating their lifespan, reliability, and performance. This indicates that accurate measurement of LED temperature is of great importance to better understand the thermal effects over a system and improve performance. Over the years, various Tj measurement techniques have been developed, and existing methods have been improved in many ways with technological and scientific advancements. Correspondingly, in order to address the governing phenomena, benefits, drawbacks, possibilities, and applications, a wide range of measurement techniques and systems are covered. This paper comprises a large number of published studies on junction temperature measurement approaches for LEDs, and a summary of the experimental parameters employed in the literature are given as a reference. In addition, some of the corrections noted in non-ideal thermal calibration processes are discussed and presented. Finally, a comparison between methods will provide the readers a better insight into the topic and direction for future research.

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Heat dissipation performance of a high-brightness LED package assembly using high-thermal conductivity filler

Cited by 16 publications

References 26 publications

Noncontact and instant detection of phosphor temperature in phosphor-converted white LEDs

Noncontact and instant detection of phosphor temperature in phosphor-converted white LEDs

A Standardized Light-Emitting Diode Device for Photoimmunotherapy

A Critical Review on the Junction Temperature Measurement of Light Emitting Diodes

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