Adhesive resin composites with ceramic nanoparticles for enhanced light extraction efficiency of sandwiched LED device structure

Park, Jin Gyeong; Ji, Myeongjun; Ko, Yun Taek; Ryu, Cheol-Hui; Kim, Jeong Hyun; Choa, Yong‐Ho; Lee, Young In

doi:10.1016/j.mtcomm.2020.101378

Cited by 1 publication

(1 citation statement)

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“…Their optimized PIG showed promising performance with lower component temperature and high efficiency in white-light extraction. Park et al [ 16 ] present the experiment result of enhanced light extraction material of the LED. They applied ZrO 2 nanoparticles of average particle size with 10 nm to the adhesive layer as an enhancer of refractive index and light scattering additives to increase the luminous efficacy and luminous flux of the white-LED in the form of polymer matrix nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

Compact Measurement of the Optical Power in High-Power LED Using a Light-Absorbent Thermal Sensor

Kim

Joo

Kim

et al. 2021

Sensors

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LED (Light-Emitting Diode) presents advantages such as luminescence, reliability, durability compared with conventional lighting. It has been widely applied for life, healthcare, smart farm, industry, and lighting from indoor to the automotive headlamp. However, the LED is vulnerable to thermal damage originated from the high junction temperature, especially in high power applications. Hence, it requires precise qualification on the optical power and the junction temperature from the pilot line to secure reliability. In this study, the photo-thermal sensor is proposed by employing a sheet-type thermocouple composed of photo-absorbent metal film and thermocouple. This sensor aims low-cost qualification in pilot line for high-power luminous devices and optical monitoring of costly luminaire such as automobile LED headlamp. The sensor is designed to detect the increased temperature response of LED hot spots from the transferred thermal power and absorbed optical power. The temperature response of each sheet-type thermocouple is utilized as a signal output of the absorbed optical power and hot spot temperature based on the introduced sensor equation. The proposed thermal sensor is evaluated by comparing the experiment with the measured reference value from the integrating sphere and the attached thermocouple at a junction. The experiment result reveals 3% of the maximum error for the optical power of 645 mW.

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Section: Introductionmentioning

confidence: 99%