4.7 Article

Optimization of the luminescence efficiency and moisture stability of a red phosphor KRb3Ge2F12:Mn4+ for indoor plant growth LED applications

Journal

CERAMICS INTERNATIONAL
Volume 48, Issue 3, Pages 4208-4215

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2021.10.212

Keywords

Luminescence efficiency; Moisture stability; Red phosphor; Indoor plant growth; LED applications

Funding

  1. National Natural Science Foundation of China of China [52172152]
  2. Key Projects of NSF of Zhejiang Province [LZ20E020003]
  3. Wenzhou Major Scientific and Technological Innovation Project [G20170005]

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A new type of Mn4+ doped phosphor KRGF:Mn has been synthesized and its moisture stability has been improved through surface modification, maintaining bright red light even after long-term immersion. The luminescence efficiency and thermal stability of KRGF:Mn have been optimized for LED lighting applications in indoor plant growth.
Owing to the ease of synthesis and the unique luminescence characteristics for the applications of white light emitting diodes (WLEDs), the red-emitting fluoride phosphors activated by Mn4+ ions are critical to achieving WLEDs with ideal color rendering index (CRI). In this work, a new type of Mn4+ doped phosphor KRb3Ge2F12: Mn4+ (KRGF:Mn) has been synthesized by a simple ion-exchange method in atmosphere. A strategy of surface modification by using a weak reducing agent oxalic acid (OA) is proposed, which can essentially improve the moisture stability of phosphor KRGF:Mn. Moreover, the modified phosphors can still maintain bright red light after being completely immersed in water for more than 100 days. A group of LEDs combined with the as synthesized phosphor KRGF:Mn as a light source can be well applied to artificial lighting for the growth of tomatoes and Chinese cabbage plants. Additionally, the luminescence efficiency of KRGF:Mn has been optimized with high thermal stability. This work will provide high-quality red phosphor for LED lighting sources that being required for indoor plant growth.

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