A Simple Method to Realize Millilens Array on Encapsulant Layer for Enhancing Light Efficiency of COB-LEDs

Yu, Xingjian; Xiang, Linyi; Pei, Naiqi; Zhou, Shuling; Luo, Xiaobing

doi:10.1109/ted.2020.3008371

Cited by 6 publications

(3 citation statements)

References 23 publications

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“…After receiving the treatment, the total effective rate of the two groups of patients, the improvement time of clinical symptoms, the time when the new granulation began to grow, and the time when the sore surface area decreased by 1/2 [ 15 ]. Healing rate of sore surface = (original sore surface area - unhealed sore surface area)/original sore surface area × 100%.…”

Section: Methodsmentioning

confidence: 99%

[Retracted] Effects of CT Combined with Modified Qinfan Decoction on Improving Sores and Promoting Angiogenesis

Wang

Xie

2022

Contrast Media & Molecular Imaging

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In order to explore the clinical treatment of severe acne, this paper proposed the effect of CT technology combined with modified qinfan decoction on improving sores and promoting angiogenesis. From October 2016 to November 2017, 69 patients with severe acne treated in the first traditional Chinese medicine hospital of a city were selected for retrospective analysis. The 69 patients were randomly divided into control group and treatment group. There were 34 patients in the control group and 35 patients in the treatment group. Patients in the control group were treated with VSD. Patients in the treatment group were treated with qinfan decoction combined with VSD. Then, the total effective rate, the time of clinical symptom improvement, the time when the new granulation began to grow, and the time when the sore surface area was reduced by 1/2 were compared between the two groups. The results showed that after treatment, the total effective rate of the treatment group was higher than that of the control group. The time for the improvement of clinical symptoms, the time for the growth of new granulation, and the time for the reduction of the sore surface area by 1/2 were shorter than those of the control group, and the healing rate of the sore surface was higher than that of the control group (P < 0.05). Qinfan decoction combined with negative pressure sealing drainage technology has a significant effect on the treatment of severe acne and can promote its rehabilitation.

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Section: Methodsmentioning

confidence: 99%

[Retracted] Effects of CT Combined with Modified Qinfan Decoction on Improving Sores and Promoting Angiogenesis

Wang

Xie

2022

Contrast Media & Molecular Imaging

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“…44 In short, the LED filament welded at 270°C has a longer life, higher reliability, and higher blue light flux, light efficiency, lower steady-state voltage and higher shear strength than LED filaments at other soldering temperatures. Luo and others 45,46 have made further research on improving the enhancement of luminous efficiency.…”

Section: Photoelectric and Thermal Properties Of Fc-led Led Filamentmentioning

confidence: 99%

Effect of Soldering Temperature on the Reliability of Sn-Ag-Cu Lead-Free Solder Joints

Zhai

Zou

et al. 2021

Journal of Elec Materi

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This paper investigates the effect of soldering temperature on solder joint voids and reliability of flip-chip LED chips during reflow soldering. Lead-free solder SAC305 was used as solder paste. The void ratio of the flip-chip LED solder joint at 250°C, 260°C, 270°C, 280°C, and 290°C reflow soldering temperatures was detected by x-ray detector. Shear tests were conducted to evaluate the influence of interfacial reactions on the mechanical reliability of solder joints. The distribution of voids in the shear section was observed by scanning electron microscope (SEM). Next, the photoelectric and thermal properties of FC-LED filament were tested and analyzed. Finally, a hightemperature and high-humidity aging experiment was carried out to test the reliability of the LED filament. The results show that the void ratio of the LED filament soldering joint is the lowest when the soldering temperature is 270°C. The small void ratio of the solder joints results in lower steady-state voltage and junction temperature of the flip-chip LED filament. As the void density in the solder joint decreases, the shear strength of the solder joint increases. At this time, the shear resistance and mechanical reliability are the highest.

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“…The results show that the chip has better lightemitting performance, higher reliability and can also improve the thermal fatigue performance of the chip (Shang et al, 2011;Ming-Te et al, 2012;Yuanbao et al, 2019). To reduce the total internal reflection effect of the chip, Yu et al (2020) proposed a complementary printing method to implement a microlens array on a flat package layer to improve the luminous efficiency of COB LEDs.…”

Section: Introductionmentioning

confidence: 99%

Effect of different soldering temperatures on the properties of COB light source

Zhao

Zou

et al. 2021

SSMT

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Purpose The purpose of this paper is to investigate the effect of different soldering temperatures on the performance of chip-on-board (COB) light sources during vacuum reflow soldering. Design/methodology/approach First, the influence of the void ratio of the COB light source on the steady-state voltage, luminous flux, luminous efficiency and junction temperature has been explored at soldering temperatures of 250°C, 260°C, 270°C, 280°C and 290°C. The COB chip has also been tested for practical application and aging. Findings The results show that when the soldering temperature is 270°C, the void ratio of the soldering layer is only 5.1%, the junction temperature of the chip is only 76.52°C, and the luminous flux and luminous efficiency are the highest, and it has been observed that the luminous efficiency and average junction temperature of the chip are 107 lm/W and 72.3°C, respectively, which meets the requirements of street lights. After aging for 1,080 h, the light attenuation is 84.64% of the initial value, which indicates that it has higher reliability and longer life. Originality/value It can provide reference data for readers and people in this field and can be directly applied to practical engineering.

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A Simple Method to Realize Millilens Array on Encapsulant Layer for Enhancing Light Efficiency of COB-LEDs

Cited by 6 publications

References 23 publications

[Retracted] Effects of CT Combined with Modified Qinfan Decoction on Improving Sores and Promoting Angiogenesis

[Retracted] Effects of CT Combined with Modified Qinfan Decoction on Improving Sores and Promoting Angiogenesis

Effect of Soldering Temperature on the Reliability of Sn-Ag-Cu Lead-Free Solder Joints

Effect of different soldering temperatures on the properties of COB light source

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