Analysis of light-emitting diodes by Monte Carlo photon simulation

Lee, Song Jae

doi:10.1364/ao.40.001427

Cited by 87 publications

(36 citation statements)

References 7 publications

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“…11 The light extraction properties of LEDs have been previously analyzed by Monte Carlo ray tracing simulations. 12,13 RTT has been previously applied to the model volumetric scattering in organic LEDs, 14 but RTT studies on the limits light extraction in textured LEDs have not been previously presented. Although the information given by RTT is similar to the ray tracing simulations, RTT provides also an analytic tool for more quantitative analysis on the origin of emission enhancement in textured LEDs.…”

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confidence: 99%

Light extraction limits in textured GaN-InGaN light-emitting diodes: Radiative transfer analysis

Heikkilä

Oksanen

Tulkki

2011

Applied Physics Letters

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We present a study on the light extraction properties of thin film light-emitting diodes (LEDs) based on the radiative transfer theory. We show that the well known ergodic limit for absorptivity in textured solar cells also applies to emissivity in LEDs accordance with the Kirchhoff’s radiation law. This limit for the emission enhancement by surface texturing in LEDs is fundamental and cannot be exceeded even with index-matched optics. We further carry out numerical calculations accounting for realistic absorption in typical GaN-InGaN LEDs to compare their performance with the ergodic limit for non-absorbing structures. The results show that the optical power of InGaN-GaN LED designs can be improved by a substantial factor of 2–4 with textured surfaces and engineering of the emission pattern and provide a guideline for more efficient LED designs.

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confidence: 99%

Light extraction limits in textured GaN-InGaN light-emitting diodes: Radiative transfer analysis

Heikkilä

Oksanen

Tulkki

2011

Applied Physics Letters

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“…In the simulation, OpticsWorks software was used and based on Monte Carlo method incorporated with Mie scattering, which is common in the LED simulation [37], [38]. Fig.…”

Section: Simulationmentioning

confidence: 99%

An Investigation of the Optical Analysis in White Light-Emitting Diodes With Conformal and Remote Phosphor Structure

Chen

Lin

et al. 2013

J. Display Technol.

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Abstract-An effective emission model of phosphor film is proposed by using bidirectional scattering distribution function system (BSDF), and the model is verified by white light-emitting diodes (LEDs) with conformal and remote phosphor structure. The emission model is built to clarify the optical characteristics by analyzing the angular-dependent distribution of emission and excitation behaviors in phosphor film. The white LEDs with conformal and remote phosphor structure are also fabricated for experimental comparison. The uniformity of angular correlated color temperature (CCT) in white LEDs can be determined by the angular distribution of blue and yellow light, which is in turns decided by the refractive index variation between chip a©nd phosphor layers. Finally, the experimental results are found to have good agreement with the simulation results performing by the Monte Carlo method.

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“…Our phosphor particle model was designed to simulate the scattering and absorbing process of light inside the phosphors. This model was based on the Mie theory, the ray tracing method, and Monte-Carlo algorithms [8][9][10][11]. A blue light LED was used to excite the phosphors, with the samples numbered R-645 and R-626 indicating red lights, G-531 and G-529 indicating green lights, and Y-561 yellow light.…”

Section: Introductionmentioning

confidence: 99%

Optical Modeling Analysis of Red, Green, and Yellow Phosphors with a Blue LED

Sun

Tien

2018

Advances in Condensed Matter Physics

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The luminous properties of red, green, and yellow phosphors with a blue LED are evaluated and a corresponding optical model is constructed using the optical simulation software LightTools5. According to the phosphor particle model, the desired chromaticity coordinate of the multicomponent light which is excited by a blue LED can be achieved by modifying the weight concentration of the phosphors. A comparison of the four types of LED package modules tested shows that the yellow phosphor encapsulated with a semispherical module takes up a lesser percentage of the total weight percentage of a constructed white light with a correlated color temperature of around 4000 K. The simulation and experimental results provide a cross-reference for better packaging and encapsulating designs for lumen improvement.

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Analysis of light-emitting diodes by Monte Carlo photon simulation

Cited by 87 publications

References 7 publications

Light extraction limits in textured GaN-InGaN light-emitting diodes: Radiative transfer analysis

Light extraction limits in textured GaN-InGaN light-emitting diodes: Radiative transfer analysis

An Investigation of the Optical Analysis in White Light-Emitting Diodes With Conformal and Remote Phosphor Structure

Optical Modeling Analysis of Red, Green, and Yellow Phosphors with a Blue LED

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