Evaluation of light extraction efficiency for the light-emitting diodes based on the transfer matrix formalism and ray-tracing method |
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Authors: | An Pingbo Wang Li Lu Hongxi Yu Zhiguo Liu Lei Xi Xin Zhao Lixia |
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Affiliation: | Semiconductor Lighting Research & Development Center, Institute of Semiconductors, Chinese Academy of Sciences,Beijing 100083, China |
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Abstract: | The internal quantum efficiency (IQE) of the light-emitting diodes can be calculated by the ratio of the external quantum efficiency (EQE) and the light extraction efficiency (LEE). The EQE can be measured experimentally, but the LEE is difficult to calculate due to the complicated LED structures. In this work, a model was established to calculate the LEE by combining the transfer matrix formalism and an in-plane ray tracing method. With the calculated LEE, the IQE was determined and made a good agreement with that obtained by the ABC model and temperature-dependent photoluminescence method. The proposed method makes the determination of the IQE more practical and conventional. |
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Keywords: | light extraction efficiency light-emitting diodes transfer matrix ray-tracing |
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