Precise simulation of spectrum for green emitting phosphors pumped by a blue LED die
| Autor: | Ching Cherng Sun, He Xiang Chen, Te Yuan Chung, Yi Neng Peng, Yu-Yu Chang, Tsung Hsun Yang, Tsung Xiang Lee, Benoit Glorieux, Ching Yi Chen |
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| Přispěvatelé: | Institute of Lighting and Display Science, National Central University [Taiwan] (NCU), Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Polytechnique de Bordeaux-Université de Bordeaux (UB), Graduate Institute of Color and Illumination Technology, National Taiwan University [Taiwan] (NTU) |
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
lcsh:Applied optics. Photonics
Materials science Phosphor 02 engineering and technology Green-light 01 natural sciences Spectral line law.invention 010309 optics 020210 optoelectronics & photonics Optics law 0103 physical sciences 0202 electrical engineering electronic engineering information engineering lcsh:QC350-467 Emission spectrum Electrical and Electronic Engineering Chromaticity Absorption (electromagnetic radiation) Diode business.industry lcsh:TA1501-1820 [CHIM.MATE]Chemical Sciences/Material chemistry Atomic and Molecular Physics and Optics Optoelectronics business lcsh:Optics. Light Light-emitting diode |
| Zdroj: | IEEE Photonics Journal, Vol 6, Iss 4, Pp 1-10 (2014) IEEE Photonics Journal IEEE Photonics Journal, Institute of Electrical and Electronics Engineers (IEEE), 2014, 6 (4), 8400512 (10 p.). ⟨10.1109/JPHOT.2014.2341012⟩ |
| ISSN: | 1943-0655 |
| DOI: | 10.1109/JPHOT.2014.2341012⟩ |
| Popis: | International audience; This paper proposes an effective approach for spectrum shaping in the optical modeling of phosphor-converted white light-emitting diodes (LEDs) in which overlapping of the absorption and emission spectra of the phosphor are considered. The spectrum shaping method was applied to explore the wavelength-dependent absorption effect and reabsorption by the green phosphor. The experimental results indicated that the adjustment factor for blue light can enable the blue light spectrum to fit well with the measured spectrum. The adjustment factor was linearly related to the transmission ratio of the blue light. The blue light emitted by the blue die and the green light emitted by the phosphor were simulated and predicted in an accurate way as compared with the experimental measurements. The enhanced accuracy in assessing the spectra resulted in enhanced precision of chromaticities. In the experiments, the color differences were one order smaller in CIE 1931 chromaticity (Δx, Δy) than in models without spectrum shaping and were almost imperceptible to the human eye. The novel optical modeling of green phosphor pumped by a blue die facilitates the application of these materials in high-color rendering in white LEDs and projection displays. |
| Databáze: | OpenAIRE |
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