Phosphor modeling and characterization

Wu, Huiying; Jenkins, David R.

doi:10.1117/1.oe.53.11.114107

Cited by 7 publications

(4 citation statements)

References 8 publications

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“…An alternative to the previously discussed ab initio approach is to use statistical methods [165]. Ray tracers (e.g., LightTools [166,167]) allow accurate simulation of light-matter interaction at surfaces. Provided the number of rays is sufficiently large, statistical processes such as the diffuse reflectance can also be approximated satisfactorily [146,[168][169][170][171][172][173][174][175][176][177][178][179][180][181].…”

Section: Monte Carlo Simulationmentioning

confidence: 99%

Absorption and Remission Characterization of Pure, Dielectric (Nano-)Powders Using Diffuse Reflectance Spectroscopy: An End-To-End Instruction

et al. 2019

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This paper addresses the challenging task of optical characterization of pure, dielectric (nano-)powders with the aim to provide an end-to-end instruction from appropriate sample preparation up to the determination of material remission and absorption spectra. We succeeded in establishing an innovative preparation procedure to reproducibly obtain powder pellet samples with an ideal Lambertian scattering behavior. As a result, a procedure based on diffuse reflectance spectroscopy was developed that allows for (i) performing reproducible and artifact-free, high-quality measurements as well as (ii) a thorough optical analysis using Monte Carlo and Mie scattering simulations yielding the absorption spectrum in the visible spectral range. The procedure is valid for the particular case of powders that can be compressed into thick, non-translucent pellets and neither requires embedding of the dielectric (nano-)powders within an appropriate host matrix for measurements nor the use of integrating spheres. The reduced spectroscopic procedure minimizes the large number of sources for errors, enables an in-depth understanding of non-avoidable artifacts and is of particular advantage in the field of material sciences, i.e., for getting first insights to the optical features of a newly synthesized, pure dielectric powder, but also as an inline inspection tool for massively parallelised material characterization.

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Section: Monte Carlo Simulationmentioning

confidence: 99%

Absorption and Remission Characterization of Pure, Dielectric (Nano-)Powders Using Diffuse Reflectance Spectroscopy: An End-To-End Instruction

et al. 2019

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“…However, these studies lack experimental data to validate their models and few people take TM-30-15 method to evaluate and optimize WLED's color performance. In this paper, we will introduce the optical models of red and green phosphors films based on Mie scattering [12,13] and Monte Carlo ray tracing [14,15] that can simulate the color performance of WLED at different phosphor concentrations, evaluate the simulated spectrum by TM-30-15 method, and then validate it by experiments.…”

Section: Introductionmentioning

confidence: 99%

Optical Model of Laminated Remote Phosphor Films and Its Application in White LED

Chen

Zhuo

Jiang

et al. 2019

Advances in Condensed Matter Physics

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Based on Mie scattering and Monte Carlo ray tracing method, the transmission process of light in the remote phosphor film is described and the optical model of red and green laminated phosphor films is constructed. The photochromic properties of the phosphor films were studied by TM-30-15 method proposed by the North American Lighting Association. The investigation discloses that the normalized cross correlation of single-layer phosphor film spectral power distribution between the simulation and experimental results is about 99%, and the deviation of color coordinates is within 0.01. Based on the monochrome phosphor optical model, we establish bicolor optical model of red and green laminated phosphor film layers to form white light and can predict its color performance. The experimental results show that the normalized cross correlation of laminated phosphor film spectral power distribution between the simulation and experiment is about 97%, and the optical model of red and green laminated phosphor film can accurately predict the index Rf and Rg. When the red and green phosphor mass ratio is 0.05:0.5, the simulated color is optimal, Rf reaches 90, and Rg reaches 100, whose corresponding experimental values are Rf=90, Rg=101.

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“…To obtain the precise optical modeling for pcLEDs, Zhu et al used a double integrating sphere system to investigate the radiant power of the transmitted and reflected light of a YAG phosphor layer illuminated by a fiber-guided source [17]. Wu et al also measured the radiant flux of the transmitted and reflected light of series phosphor layers with a double integrating sphere system, and then used the result to optimize the Mie parameters in optical simulation [18]. Kang et al [19] developed a 1-D model to calculate the light absorption and conversion in the phosphor layer and Hu et al improved this model by further considering the scattering effect [20], [21].…”

Section: Introductionmentioning

confidence: 99%

Precise Optical Modeling of Phosphor-Converted LEDs With Arbitrary Concentration and Thickness Using Bidirectional Scattering Distribution Function

Tang

Chen

et al. 2018

IEEE Photonics J.

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Phosphor-converted light-emitting diode (pcLED) is one of the most promising methods to generate white light. The interaction of the excitation light with the phosphor in pcLED is a complicated phenomenon, combining light absorption, light conversion, and scattering. An effective and efficient way to predict the optical behavior of pcLED is using the bidirectional scattering distribution function (BSDF). In this paper, the BSDF for pcLEDs with arbitrary phosphor concentration and thickness was established. The measured integrating energy and angular distributions of BSDF were successfully fitted by the interpolation method and the ABg model, respectively, realizing the calculation of BSDF values for arbitrary phosphor configurations. The proposed model was applied to a remote pcLED using an arbitrary phosphor configuration in Monte Carlo simulation. The output radiant power and the angular distributions of the blue and yellow light show good agreements between experiments and simulations; the errors of radiant power were all less than 4%, validating the effectiveness of the model. Consequently, this study provides a simple and useful tool to precisely predict the optical performance of pcLEDs with arbitrary concentration and thickness, it is essential for white LED design and fabrication.

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Phosphor modeling and characterization

Cited by 7 publications

References 8 publications

Absorption and Remission Characterization of Pure, Dielectric (Nano-)Powders Using Diffuse Reflectance Spectroscopy: An End-To-End Instruction

Absorption and Remission Characterization of Pure, Dielectric (Nano-)Powders Using Diffuse Reflectance Spectroscopy: An End-To-End Instruction

Optical Model of Laminated Remote Phosphor Films and Its Application in White LED

Precise Optical Modeling of Phosphor-Converted LEDs With Arbitrary Concentration and Thickness Using Bidirectional Scattering Distribution Function

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