Novel Method for Estimating Phosphor Conversion Efficiency of Light-Emitting Diodes

Lin, Chih Hao; Huang, Che Hsuan; Pai, Yung Min; Lee, Chung Fu; Lin, Chun‐Yuan; Sun, Chia‐Wei; Chen, Cheng-Huan; Sher, Chin Wei; Kuo, Hao‐Chung

doi:10.3390/cryst8120442

Cited by 6 publications

(5 citation statements)

References 28 publications

(33 reference statements)

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“…Furthermore, the parameter (Eλ1-λ2,system) can be calculated using equation 5with l equal to 0 and equation 3with l equal to any value. The singular scatter system had been successfully proven in a previous study [18].…”

Section: Algorithm Derivation I: Singular Emitter Model Forms Downmentioning

confidence: 95%

Research on a Novel GaN-Based Converted Mini-LED Backlight Module via a Spectrum-Decouple System

et al. 2020

Self Cite

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Owing to the development of modern display technology, micro-and mini-light-emitting diodes (LEDs) have affected technological advancements in the display industry. The structure of mini-LEDs is completely different than that of traditional LED backlights because the former employs a display technology with an LED array structure, optical resonant cavity, and color conversion layer. Display backlight technology encounters difficulty in achieving a truly effective energy-loss mechanism when designing or measuring mini-LED performance. The present study proposes three major mini-LED energy loss mechanisms: cross-talk, resonant, and quantum conversion losses. Herein, the spectrum was obtained through the integrating sphere system, and the calculation mechanism was formed by the down-conversion theorem as the decoupling principle, which successfully calculated the independent energy-loss efficiency of each mechanism and effectively deduced the brightness and color saturation performance of this design combination.

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Section: Algorithm Derivation I: Singular Emitter Model Forms Downmentioning

confidence: 95%

Research on a Novel GaN-Based Converted Mini-LED Backlight Module via a Spectrum-Decouple System

et al. 2020

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“…To improve CRI, the photoluminescence of color‐converting layer and its stability need to be continuously improved. [ 45 ]…”

Section: Fundamental Mechanisms Of Nanoantenna‐enhanced Ledmentioning

confidence: 99%

Nanoantenna‐Enhanced Light‐Emitting Diodes: Fundamental and Recent Progress

Wang

et al. 2021

Laser & Photonics Reviews

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Light‐emitting diodes (LEDs) are a promising solution for energy‐saving illumination, terminal display technology, and visible light communication. Driven by the vast markets of these emergent applications, the everlasting demand for LED devices is to continuously improve the luminous efficiency and lifetime while minimizing costs. The luminous efficiency of LEDs can be improved from various perspectives including materials, nanofabrication, encapsulation, and other fields, mainly to increase the internal quantum efficiency of the active layer, the light extraction efficiency, the directionality of luminous emission, and the photoluminescence of color‐converting layer. A nanoantenna is a delicately designed functional structure with strong capabilities in decay rate enhancement, light regulation, and other unique optical and electrical characteristics, which fully meet the needs of LED emission enhancement. Starting from the mechanism of nanoantennas, how to enhance LEDs by nanoantennas made of metals, dielectrics, and mixtures of both is discussed. By considering some practical cases, the review of the enhanced functionalities of LEDs under the function of nanoantenna are provided. On top of that, the great potential of nanoantennas for the use in micro‐ and nanostructures, layered structures, and other new LED geometries, and for the active control of LEDs using reprogrammable nanoantennas is also put forward.

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“…Combining the electrical-thermal model, electrical-luminous model and thermal-luminous model together, the thermal-electrical-luminous model derived from the automatic control theory was proposed by Huang et al to study the dynamic performances of RGB LED [28]. Lin et al [29] proposed a novel method based down-conversion luminescence efficiency (DCLE) concept, connecting the total absorption ratio of phosphor, to estimate the conversion efficiency of phosphor accurately of phosphor converted WLED. In addition, some researchers [30][31][32][33] built the equivalent circuit to simulate the photo-electro-thermal coupling effect for WLEDs, and they used the Simulation Program with Integrated Circuit Emphasis (SPICE) to simulate the junction temperature, luminous flux or power density of WLEDs.…”

Section: Introductionmentioning

confidence: 99%

Dynamic prediction of optical and chromatic performances for a light-emitting diode array based on a thermal-electrical-spectral model

Fan¹,

Chen²,

Yuan³

et al. 2020

Opt. Express

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Light-emitting diode (LED) arrays have attracted increased attention in the area of high power intelligent automotive headlamps because of their superiority in disposing of the power limit of an individual LED package and controllably luminous intensity and illumination pattern. The optical and chromatic performances of an LED array do not equal to the sum of individual LED packages' performances, as the thermal interactions between individual LED packages can't be ignored in the actual application. This paper presents a thermal-electrical-spectral (TES) model to dynamically predict the optical and chromatic performances of the LED array. The thermal-electrical (TE) model considering the thermal coupling effect in the LED array is firstly proposed to predict the case temperature of each individual LED package, and the Spectral power distributions (SPDs) of individual LED package is then decomposed by the extended Asym2sig model to extract the spectral characteristic parameters. Finally, the experimental measurements of the designed LED arrays operated under usage conditions are used to verify the TES model. Some validation case studies show that the prediction accuracy of the proposed TES model, which is expressed as a quadratic polynomial function of current and case temperature, can be achieved higher than 95%. Therefore, it can be concluded that this TES model offers a convenient method with high accuracy to dynamically predict the optical and chromatic performances of LED arrays at real usages.

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Novel Method for Estimating Phosphor Conversion Efficiency of Light-Emitting Diodes

Cited by 6 publications

References 28 publications

Research on a Novel GaN-Based Converted Mini-LED Backlight Module via a Spectrum-Decouple System

Research on a Novel GaN-Based Converted Mini-LED Backlight Module via a Spectrum-Decouple System

Nanoantenna‐Enhanced Light‐Emitting Diodes: Fundamental and Recent Progress

Dynamic prediction of optical and chromatic performances for a light-emitting diode array based on a thermal-electrical-spectral model

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