Defects in crystals act to encourage recombination
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The statement is true.
In case the substrate crystals and the epitaxial layer have different crystal lattice parameters there is a lattice mismatch between the two crystal structures. This leads to lattice strain in the LED layer. As a result crystal defects occur.
Crystal defects encourage radiationless EHP recombinations. Therefore a defect acts like a recombination center.
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