am2c02698_si_002.xlsx (70.21 kB)
Multiobjective Machine Learning-Assisted Discovery of a Novel Cyan–Green Garnet: Ce Phosphors with Excellent Thermal Stability
datasetposted on 2022-03-22, 15:09 authored by Lipeng Jiang, Xue Jiang, Yan Zhang, Changxin Wang, Pei Liu, Guocai Lv, Yanjing Su
Ce-doped garnet phosphors play an important role in the white light-emitting diode (LED) family. In the past years, a lot of trial-and-error experiments guided by experience to discover phosphors suitable for white LEDs have been presented. The working temperature of phosphors may reach 200 °C in white LEDs, and so, the exploration of phosphors with excellent thermal stability at the desired wavelength continues to be a challenge. In the present study, to discover novel cyan–green garnet:Ce phosphors, wavelength and thermal stability machine learning models were built by constructing reasonable features. Among the 171,636 compounds with garnet structures predicted by our models, 25 samples were selected for preparation and characterization by multiobjective optimization based on active learning. Lu1.5Sr1.5Al3.5Si1.5O12:Ce performed the best with excellent thermal stability (≥60% emission intensity was retained at 640 K) and exhibited emission peaks of about 505 nm, and it is a very promising phosphor for future applications, especially in high-temperature operating environments.
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multiobjective optimization basedgarnet structures predictedexcellent thermal stabilityerror experiments guidedconstructing reasonable featurestemperature operating environmentsmultiobjective machine learningexhibited emission peaksdiscover phosphors suitabledesired wavelength continues5 subworking temperatureemission intensityactive learningwhite lightwhite ledspromising phosphorpresent studypast yearsimportant rolefuture applicationsemitting diodece phosphorsassisted discovery640 k636 compounds505 nm25 samples