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Optimization of output and phosphor consumption for phosphor-converted white light-emitting diodes

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Abstract

Using ray-tracing simulation based on Monte Carlo method, the effects of phosphor concentration and thickness on light output and phosphor consumption of pc-wLEDs were investigated in this work. The simulation was improved to comprehensively imitate the whole optical process of pc-wLEDs, including total produce of chip and phosphor light, losses in the propagation, and output. Experiments were conducted to verify the simulation. Results show that, light output changes non-monotonously over phosphor concentration and thickness, having maximum value. Experimental maximum light efficiency of 158 lm·W−1 was obtained at concentration of 16 wt%, 6 % higher than that of 11 wt% and 17 % higher than that of 33 wt%. Phosphor consumption of pc-wLEDs increases linearly with the increase of phosphor concentration and the decrease of thickness. Experimental phosphor consumption of pc-wLEDs with concentration of 11 wt% is only 37 % of that of 33 wt%.

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Acknowledgments

This study was financially supported by the National Natural Science Foundation of China (No. 51272027) and the Ph. D. Programs Foundation of Education Ministry of China (No. 20100006110011).

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Authors and Affiliations

  1. School of Materials Science & Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Dong-Chuan Chen & Quan-Lin Liu

  2. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, China

    Quan-Lin Liu

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  1. Dong-Chuan Chen
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Correspondence to Quan-Lin Liu.

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Chen, DC., Liu, QL. Optimization of output and phosphor consumption for phosphor-converted white light-emitting diodes. Rare Met. 33, 203–209 (2014). https://doi.org/10.1007/s12598-013-0211-1

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  • DOI: https://doi.org/10.1007/s12598-013-0211-1

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