Estimation of Luminous Flux and Luminous Efficacy of Low-Power SMD LED as a Function of Injection Current and Ambient Temperature

Raypah, Muna E.; Sodipo, Bashiru Kayode; Devarajan, Mutharasu; Sulaiman, Fauziah

doi:10.1109/ted.2016.2556079

Cited by 27 publications

(17 citation statements)

References 20 publications

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“…By using the proportionality concept, verified by the measurements on many actual LED samples (with peak wavelengths chosen from different ranges of the visible range), appears in Equation (17): Figure 10 shows the measured of a royal blue power LED at several currents, from 10 mA to 1 A at a fixed = 85 °C. A Shockley type operation can be observed at low currents.…”

Section: Modeling the Electrical Characteristicsmentioning

confidence: 96%

“…Many research teams have realized the importance of characterizing LEDs in multiple domains of operation. Mostly, these studies used empirical and sometimes rough approximations to obtain model parameters from measured data, see, e.g., [13][14][15][16][17]. In [13], an emphasis was placed on modelling LEDs' efficiency.…”

Section: The Wider Backgroundmentioning

confidence: 99%

“…The authors of [14] with their ambitious target design of retrofitted LED lamps, used the photo-electro-thermal theory, which in our view is a relatively rough, empirical way of describing LED behavior. The authors of [15][16][17] in their work relied on LED characterization tools that have been introduced to the SSL industry as a result of our team's pioneering work in multi-domain characterization [18,19]. In [15][16][17] (that are representative examples of the literature in the field), certain aspects of the junction temperature affected LED operating parameters were investigated, such as the electrical power [15], efficiency [16], and luminous flux [17].…”

Section: The Wider Backgroundmentioning

confidence: 99%

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Multi-Domain Modelling of LEDs for Supporting Virtual Prototyping of Luminaires

et al. 2019

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This paper presents our approaches to chip level multi-domain LED (light emitting diode) modelling, targeting luminaire design in the Industry 4.0 era, to support virtual prototyping of LED luminaires through luminaire level multi-domain simulations. The primary goal of such virtual prototypes is to predict the light output characteristics of LED luminaires under different operating conditions. The key component in such digital twins of a luminaire is an appropriate multi-domain model for packaged LED devices that captures the electrical, thermal, and light output characteristics and their mutual dependence simultaneously and consistently. We developed two such models with this goal in mind that are presented in detail in this paper. The first model is a semi analytical, quasi black-box model that can be implemented on the basis of the built-in diode models of spice-like circuit simulators and a few added controlled sources. Our second presented model is derived from the physics of the operation of today’s power LEDs realized with multiple quantum well heterojunction structures. Both models have been implemented in the form of visual basic macros as well as circuit models suitable for usual spice circuit simulators. The primary test bench for the two circuit models was an LTspice simulation environment. Then, to support the design of different demonstrator luminaires of the Delphi4LED project, a spreadsheet application was developed, which ensured seamless integration of the two models with additional models representing the LED chips’ thermal environment in a luminaire. The usability of our proposed models is demonstrated by real design case studies during which simulated light output characteristics (such as hot lumens) were confirmed by luminaire level physical tests.

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Section: Modeling the Electrical Characteristicsmentioning

confidence: 96%

Section: The Wider Backgroundmentioning

confidence: 99%

Section: The Wider Backgroundmentioning

confidence: 99%

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Multi-Domain Modelling of LEDs for Supporting Virtual Prototyping of Luminaires

et al. 2019

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“…Solid‐state lighting technology was designed with some improved features; for example, they are more compact and rugged and have low operating power demand and high luminous flux; their colors do not wash out, thereby making them reliable for retail and display; they have long lifetime of more than 50 000 hours; they are directional to the exact point of need and designed with flexibility to be mounted in either simple or complex locations; and they are environmentally friendly . However, reduction in the size of light‐emitting diodes (LEDs) to make them more compact is always accompanied by difficulties in their thermal management; these difficulties resulted in an increase of junction temperature, an increase in thermal resistance, deterioration, and failure of the lighting device . Excessive heat is generated and retained within the LED package.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer enhancement in light‐emitting diode packaging employing different molar concentration of magnesium oxide thin films as a heat spreader

et al. 2020

Self Cite

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To solve thermal management difficulties created by miniaturization of lightemitting diode package, magnesium oxide thin film was spin coated on the aluminum 5052-grade substrate and employed for heat spreading and improvement of the thermal path for heat removal from light-emitting diode parcel to ambient. Thickness of different films of magnesium oxide was prepared from 0.6M and 0.8M precursors to find out the effects of films thickness and molar concentrations towards perfect heat spreading. Results from X-ray diffraction (XRD) proves the MgO thin film as cubic with the crystalline orientations of (200), (220), and (222). Good results were highlighted through 20 layers (0.6M) MgO thin film in respect to its transient thermal analysis compared with other layers from 0.6M and 0.8M and bare Al substrate; this was due to its nonporous and evenly distributed particles size (56.0 nm), film thickness (301.7 nm), surface roughness (121 nm), higher thermal conductivity (26.3 W/ mK), and free from internal cracks and defects. Lower total thermal resistance (11.4 K/W), lower junction temperature (98.8 C), optimal thermal impedance (36.43 C), higher illumination from light-emitting diode, and operation within safe operating temperature range (2700-3000 K) for high-power light-emitting diodes were all recorded at 700 mA from the tested light-emitting diode mounted on 20 layers (0.6M) magnesium oxide thin film. This study consequently proved magnesium oxide thin film as an alternative heat spreader in lighting technology packaging.

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“…Visible spectrum light-emitting diodes (LEDs) are widely used for lighting and indicators [1], [2]. The main benefits of using LEDs are low heat production compared to conventional light sources, the long life span [3], [4] and the high brightness [5].…”

Section: Introductionmentioning

confidence: 99%

Analysis of insulated-metal-substrates structures in the context of heat dissipation enhancement

Klarmann

Manesh

Hoenle

et al. 2017

2017 Internet Technologies and Applications (ITA)

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This paper discusses analysis of an insulated-metalsubstrates structure of a printed circuit board in terms of the temperature management of p-n junction of LEDs mounted on the structure's surface. The structure material and surface area are used for the heat transfer between the junction and the ambient surroundings. The heat dissipation has been simulated for conductor layer thicknesses in the range from 50μm to 200μm and the dielectric layer thicknesses from 50μm to 150μm. The thermal simulation has been conducted for two base layer materials-aluminum and copper having the same thickness of 920μm. The results of the simulation provide optimum thickness of the structure materials and their thermal conductivity to ensure most efficient heat dissipation.

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Estimation of Luminous Flux and Luminous Efficacy of Low-Power SMD LED as a Function of Injection Current and Ambient Temperature

Cited by 27 publications

References 20 publications

Multi-Domain Modelling of LEDs for Supporting Virtual Prototyping of Luminaires

Multi-Domain Modelling of LEDs for Supporting Virtual Prototyping of Luminaires

Heat transfer enhancement in light‐emitting diode packaging employing different molar concentration of magnesium oxide thin films as a heat spreader

Analysis of insulated-metal-substrates structures in the context of heat dissipation enhancement

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