A high quantum efficiency plant growth LED by using a deep-red-emitting α-Al2O3:Cr3+ phosphor

Although it has been extensively studied for decades, the α-Al2O3:Cr3+ 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-Al2O3:Cr3+ phosphor...

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Bibliographic Details
Published in:Dalton transactions : an international journal of inorganic chemistry 2021-09, Vol.50 (36), p.12570-12582
Main Authors: Nguyen Van Quang, Nguyen Thi Huyen, Nguyen, Tu, Do, Quang Trung, Dao, Duc Anh, Tran, Manh Trung, Nguyen, Duy Hung, Dao, Xuan Viet, Pham, Thanh Huy
Format: Article
Language:English
Subjects:
Aluminum oxide
Light emitting diodes
Phosphors
Plant growth
Quantum efficiency
Trivalent chromium
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Summary:Although it has been extensively studied for decades, the α-Al2O3:Cr3+ 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-Al2O3:Cr3+ phosphor onto a near-ultraviolet (NUV) chip. The α-Al2O3:Cr3+ 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-Al2O3:0.6%Cr3+ 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-Al2O3:0.6%Cr3+ phosphor on a NUV chip are (x = 0.5650, y = 0.2429) and 87.1%, respectively.
ISSN:1477-9226
1477-9234
DOI:10.1039/d1dt00115a