Deep-red emitting Mg 2 TiO 4 :Mn 4+ phosphor ceramics for plant lighting
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ISSN 2226-4108 CN 10-1154/TQ
Research Article
Deep-red emitting Mg2TiO4:Mn4+ phosphor ceramics for plant lighting Zixin WANGa, Hui LINa,*, Dawei ZHANGa, Yiming SHENa, Yang LIa, Ruijin HONGa, Chunxian TAOa, Zhaoxia HANa, Lei CHENb, Shengming ZHOUc a
Engineering Research Center of Optical Instrument and System, Ministry of Education and Shanghai Key Lab of Modern Optical System, University of Shanghai for Science and Technology, No. 516 Jungong Road, Shanghai 200093, China b Department of Pathology, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200093, China c Laboratory of Micro-Nano Optoelectronic Materials and Devices, Key Laboratory of Materials for High-Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China Received: May 25, 2020; Revised: August 19, 2020; Accepted: September 4, 2020 © The Author(s) 2020.
Abstract: In this study, deep-red emitting Mg2TiO4:Mn4+ phosphor ceramics were synthesized by the high temperature solid-state reaction method. The ceramics can be excited by the 465 nm blue light and had a narrow emission with a full width at half maximum (FWMH) value of 31 nm. The peak wavelength was located at 658 nm, which matched the demanded wavelength for photosynthesis. The crystal field strength (Dq) and the Racah parameters (B and C) were estimated by the Tanabe–Sugano diagram. The thermal conductivity of the Mg2Ti(0.999)O4:0.001Mn4+ ceramic was 7.535 W/(m·K) at room temperature, which was one order of magnitude higher than that of the traditional packaging method using the silicone gel. A set of phosphor converted LEDs were fabricated by mounting the phosphor ceramics onto the 460 nm blue LED chips and the CIE coordinates can move from the blue region to the purple light region with the thickness of the ceramic increasing. These results indicated that the Mg2TiO4:Mn4+ phosphor ceramic was suitable for plant lighting when combined with a blue LED chip. Keywords: solid state reaction; optical properties; thermal conductivity; ceramic phosphor
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Introduction
In the past few decades, it has been proved that artificial light sources can improve the growth of plants [1]. But the conventional light sources such as the incandescent lamps, the metal-halide lamps, the fluorescent lamps, and the high-pressure sodium lamps, * Corresponding author. E-mail: [email protected]
suffer from low energy efficiency because the green and yellow spectral parts of these light sources are unsuitable for plant growth [2]. Due to that the blue light (400–500 nm) and the red light (640–680 nm) affect photosynthesis and phototropism, the artificial light source should contain blue and red light [3–5]. As a new generation lighting technology, light emitting diode (LED) has the advantages of long lifetime, narrow emission bandwidth, and adjustable output, which makes it possible to achieve a specific spectral
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J Adv Ceram 2020, 9(6): 0–0
composition [6]. The combination of red and blue LEDs has been wi
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