In the temperature range from 50 to 75 °C, the intensity ratio of Eu 2+ emission to exciton emission shows an increasing trend, while it is opposite in the temperature range from 75 to 100 °C.
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Strain-Negligible Eu<sup>2+</sup> Doping Enabled Color-Tunable Harsh Condition-Resistant Perovskite Nanocrystals for Superior Light-Emitting Diodes.
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