Advanced light emitting devices for optoelectronic applications

Kováč, J.; Jakabovič, J.; Kytka, M.

doi:10.1117/12.818081

Cited by 10 publications

(8 citation statements)

References 15 publications

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“…This has resulted in the rapid replacement of most conventional light sources in indoor illumination systems by LEDs. [1][2][3][4][5] A similar situation arises in the case of light sources aimed at specific uses, such as medical applications.…”

Section: Introductionmentioning

confidence: 99%

Design of a uniform irradiance source based on light emitting diodes

Villafañe

Valor²,

Rosa

et al. 2021

Lighting Research & Technology

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Many applications in various fields require uniform illumination from light sources, for example, in medical imaging in the biophotonics area. In this work, the design and application of an annular light-emitting diode array capable of producing a homogeneous irradiance pattern is presented. As part of the design process, software that allows the simulation of the irradiance pattern as a function of the LED’s radiant intensity distribution, and the position and inclination angle of the LEDs, was developed and validated. Based on the simulation results, a source that produces homogeneous illumination over an area of 20 mm in diameter, where the lowest irradiance is more than 94% of the maximum irradiance, was constructed and tested in real conditions. The simulation method and theoretical calculations on which the array is based can be applied to the design of sources for other applications where a homogeneous irradiance is required.

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Section: Introductionmentioning

confidence: 99%

Design of a uniform irradiance source based on light emitting diodes

Villafañe

Valor²,

Rosa

et al. 2021

Lighting Research & Technology

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“…Traditional light sources have been replaced by cost-effective lightemitting diodes (LEDs) for their longevity, lower power consumption, fast switching times etc.. This resulted in using LEDs as light sources for digital communication [1][2][3][4]. Significant amount of research has been done in adapting well known wireless techniques to indoor VLC [5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Optimum power allocation for uniform illuminance in indoor visible light communication

Varma¹

2018

Opt. Express

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Abstract:In this paper an optimal power allocation scheme is proposed to acheive uniform illuminance. Regular arrays and random geometries are considered for an arrangement of the source LEDs. Uniform illuminance is accomplished by considering the variance of the received power on the receiver plane as metric and framing it as a convex optimization problem. Numerical results show that the quality factor of random geometries are superior to fixed geometries. While preserving uniformity, the cost of the system can be reduced when random geometries are used.

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“…Lately, there has been tremendous interest in using it for free space communication [1]. This has simultaneously been accompanied by significant interest in light emitting diodes (LEDs) that have been replacing conventional light sources in almost all applications [2][3][4]. Fair amount of existing literature has focused on achieving uniform irradiance over a planar surface [5][6][7][8], beginning with the problem of finding the optimal LED geometry at the light source to achieve uniform irradiance [9].…”

Section: Introductionmentioning

confidence: 99%

Power allocation for uniform illumination with stochastic LED arrays

et al. 2017

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In this paper, a simple heuristic power allocation scheme is proposed for a random LED array to obtain uniform irradiance on the projection surface. This is done by considering a binomial point process (BPP) for modeling the LED location and using the quality factor as a performance metric. Numerical results are provided to validate the proposed model and demonstrate its simplicity over existing LED geometries.

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Advanced light emitting devices for optoelectronic applications

Cited by 10 publications

References 15 publications

Design of a uniform irradiance source based on light emitting diodes

Design of a uniform irradiance source based on light emitting diodes

Optimum power allocation for uniform illuminance in indoor visible light communication

Power allocation for uniform illumination with stochastic LED arrays

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