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A series of YAG:Ce,Mn transparent ceramics were prepared via a solid-state reaction-vacuum sintering method. The effects of various Mn2+–Si4+ pair doping levels on the structure, transmittance, and luminescence properties were systematically investigated. These transparent ceramics have average grain sizes of 10–16 μm, clean grain boundaries, and excellent transmittance up to 83.4% at 800 nm. Under the excitation of 460 nm, three obvious emission peaks appear at 533, 590, and 745 nm, which can be assigned to the transition 5d→4f of Ce3+ and 4T16A1 of Mn2+. Thus, the Mn2+–Si4+ pairs can effectively modulate the emission spectrum by compensating broad orange-red and red spectrum component to yield high quality warm white light. After the optimized YAG:Ce,Mn transparent ceramic packaged with blue light-emitting diode (LED) chips, correlated color temperature (CCT) as low as 3723 K and luminous efficiency (LE) as high as 96.54 lm/W were achieved, implying a very promising candidate for application in white light-emitting diodes (WLEDs) industry.


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Red-emitting YAG:Ce,Mn transparent ceramics for warm WLEDs application

Show Author's information Junrong LINGa,bYoufu ZHOUa( )Wentao XUaHe LINaShuai LUa,bBin WANGa,bKun WANGc
Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China
University of Chinese Academy of Sciences, Beijing 100049, China
School of Materials Science and Energy Engineering, Foshan University, Foshan 528000, China

Abstract

A series of YAG:Ce,Mn transparent ceramics were prepared via a solid-state reaction-vacuum sintering method. The effects of various Mn2+–Si4+ pair doping levels on the structure, transmittance, and luminescence properties were systematically investigated. These transparent ceramics have average grain sizes of 10–16 μm, clean grain boundaries, and excellent transmittance up to 83.4% at 800 nm. Under the excitation of 460 nm, three obvious emission peaks appear at 533, 590, and 745 nm, which can be assigned to the transition 5d→4f of Ce3+ and 4T16A1 of Mn2+. Thus, the Mn2+–Si4+ pairs can effectively modulate the emission spectrum by compensating broad orange-red and red spectrum component to yield high quality warm white light. After the optimized YAG:Ce,Mn transparent ceramic packaged with blue light-emitting diode (LED) chips, correlated color temperature (CCT) as low as 3723 K and luminous efficiency (LE) as high as 96.54 lm/W were achieved, implying a very promising candidate for application in white light-emitting diodes (WLEDs) industry.

Keywords:

Mn2+ red-emitting, YAG:Ce,Mn transparent ceramics, white light-emitting diodes (WLEDs) application, low color temperature
Received: 30 April 2019 Revised: 11 July 2019 Accepted: 10 August 2019 Published: 05 February 2020 Issue date: February 2020
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Publication history

Received: 30 April 2019
Revised: 11 July 2019
Accepted: 10 August 2019
Published: 05 February 2020
Issue date: February 2020

Copyright

© The author(s) 2019

Acknowledgements

This work was supported by the CAS Priority Research program (XDB20010300, XDA21010204), National Natural Science Foundation of China (201501178), and Natural Science Foundation of Fujian Province (2017H0048).

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