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Article Abstract
Although it has been extensively studied for decades, the α-AlO:Cr phosphor has rarely been investigated for horticultural lighting. In this work, for the first time, a prototype of a plant growth light-emitting diode (LED) has been fabricated by coating a deep-red-emitting α-AlO:Cr phosphor onto a near-ultraviolet (NUV) chip. The α-AlO:Cr phosphor, synthesized by a co-precipitation method and annealed at 1500 °C for 2 h, emits an outstanding narrow peak at 695 nm. The α-AlO:0.6%Cr phosphor shows a high activation energy of 0.29 eV, a long lifetime of 3.4 ms, and a superior color purity of 100%. The chromatic coordinates and the QE value of the red LED obtained by coating an α-AlO:0.6%Cr phosphor on a NUV chip are ( = 0.5650, = 0.2429) and 87.1%, respectively.
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