Effects of the optical absorption of a LED chip on the LED package

Kim, Ki‐Hyun; Kim, Wan Ho; Jeon, Sie-Wook; Choi, Minho; Song, Sang-Bin; Kim, Jae Pil

doi:10.1016/j.sse.2015.06.007

Cited by 5 publications

(3 citation statements)

References 17 publications

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“…In addition, however, improvement of the LED packaging (PKG) light extraction efficiency η PKG is also important. [4][5][6][7] The PKG performance is primarily determined by the structure 8 and optical properties of the PKG components. The optical properties of PKG components are particularly important parameters as regards LED product performance, because an electric input loss of more than 10% is caused by the PKG.…”

Section: Introductionmentioning

confidence: 99%

Optimization of surface-mount-device light-emitting diode packaging: investigation of effects of component optical properties on light extraction efficiency

et al. 2016

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An investigation of the effects of the optical properties of surface-mount-device (SMD) light-emitting diode (LED) (side-view and top-view LEDs) packaging (PKG) components on the light extraction efficiency η PKG using ray-tracing simulations is presented. In particular, it is found that the optical properties of the PKG resin and the lead-frame (L/F) silver-plating significantly affect η PKG. Thus, the effects of the surface reflection methods of these components are investigated in order to optimize the optical design of the LED PKG. It is shown that there exists peak extraction efficiency for each PKG, and the cavity angle formed by the cavity wall is important to the optical design. In addition, the effect of phosphor present in the mold resin is examined using a Mie scattering simulation. Finally, an SMD LED PKG optical design method is proposed on the basis of the simulation results.

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Section: Introductionmentioning

confidence: 99%

Optimization of surface-mount-device light-emitting diode packaging: investigation of effects of component optical properties on light extraction efficiency

et al. 2016

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“…Due to the scattering of the phosphor, the total internal reflection (TIR) at the light extraction surface is not paid much attention. Many people find that flat devices show similar LEEs compared to the structured devices [2,10,23,24]. However, the TIR and Fresnel losses still remain on the light extraction surface [11,16,[25][26][27], which should be alleviated to enhance the LEE of white LEDs.…”

Section: Introductionmentioning

confidence: 99%

Effect of Amorphous Photonic Structure Surface Mounted on Luminous Performances of White LED

Huang¹,

Chen

Nie

et al. 2022

Crystals

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We fabricated amorphous photonic structures (APSs) with different periods and hole diameters. The GaN-based white light emitting diodes (LEDs) at nominal correlated color temperatures (CCTs) of 5000 and 6000 K were surface mounted by these APSs. The electroluminescence (EL) measurements showed less luminous efficiency (LE) and higher CCT than the ones of the virginal white LEDs. However, the LEs of many APS-mounted white LEDs increased compared to white the LEDs without APSs at the same CCTs. A finite-difference time-domain (FDTD) simulation was carried out on the ASPs surface-mounted white LEDs and bidirectional scattering distribution functions (BSDFs) of different emissions were transferred to a Monte Carlo ray tracing simulation. The simulated LEs and CCTs conformed well to the experimental ones. The effects of the blue emission transmission and phosphor concentration were simulated to predict the absolute LE enhancement methods for white LEDs. At last, the hopeful APSs for high Les’ general lighting were discussed.

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“…White SMD LEDs composed of a blue LED chip and yellow phosphor, are used for electronic instruments such as LED illuminations and liquid-crystal-display back-lights. Improvement of not only the LED chip output but also the light extraction efficiency of the LED packaging (PKG) is important factor in the development of all LEDs [4][5][6] because an electric input loss caused by the PKG is higher than 10% [7].…”

Section: Introductionmentioning

confidence: 99%

Investigation of effects of phosphor particles on optimal design of surface‐mount‐device light‐emitting diode packaging using ray‐tracing simulation

Kashiwao

Hiura

Ikeda

et al. 2018

IET Optoelectronics

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Effects of the optical absorption of a LED chip on the LED package

Cited by 5 publications

References 17 publications

Optimization of surface-mount-device light-emitting diode packaging: investigation of effects of component optical properties on light extraction efficiency

Optimization of surface-mount-device light-emitting diode packaging: investigation of effects of component optical properties on light extraction efficiency

Effect of Amorphous Photonic Structure Surface Mounted on Luminous Performances of White LED

Investigation of effects of phosphor particles on optimal design of surface‐mount‐device light‐emitting diode packaging using ray‐tracing simulation

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