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Enhanced Luminous Efficiency of WLEDs Using a Dual-Layer Structure of the Remote Phosphor Package

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8 Author(s)
Kuo-Ju Chen ; Dept. of Photonics, Nat. Chiao Tung Univ., Hsinchu, Taiwan ; Hsin-Chu Chen ; Min-Hsiung Shih ; Chao-Hsun Wang
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This study demonstrates how the insertion of a thin silicone layer into a dual-layer remote phosphor structure enhances light extraction in white light-emitting diodes (WLEDs). In the experiment, a dual-layer phosphor structure yielded a higher intensity of blue and yellow components than a conventional structure. Moreover, the lumen flux was 5% higher than a conventional remote phosphor package at the same correlated color temperature (CCT). Using a TFCalc32 simulation, the electric field intensity was calculated for different thicknesses of the dual-layer remote phosphor structures, and the enhanced use of blue rays was verified. Additionally, the dual-layer structure reduces chromaticity deviations as the driving current increases.

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Lightwave Technology, Journal of  (Volume:31 ,  Issue: 12 )