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Efficient white light‐emitting diodes (LEDs) with an efficacy of 200 lm W−1 are much desirable for lighting and displays. The phosphor‐based LEDs in use today for display applications offer poor color saturation. Intensive efforts have been made to replace the phosphor with quantum‐dot‐based downconverters, but the efficiency and stability of these devices are still in their infancy. Quantum rods...
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