Photonic crystal (PhC) phosphor is a paradigm-shifting structural platform that the authors’ group has developed. In this study, two major changes are introduced to the existing two-dimensional PhC phosphor: an increase in the refractive index contrast by replacing the PhC backbone material and the planarization of phosphor surface by the squeegee method. Compared with the reference phosphor, the upgraded PhC phosphor exhibits ~59 times enhanced absorption (simulated) and ~7 times enhanced phosphor emission (experimental). Although already impressive, the huge gap between theory and experiment indicates ample room for further improvement through, for example, the refinements in device fabrication.
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