Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 7, Issue 14, Pages 4109-4117Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9tc00606k
Keywords
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Funding
- National Natural Science Foundation of China [51572065, 51802064]
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Laser lighting, generally consisting of a blue laser and downconversion phosphors, is considered to be the next promising form of illumination to replace traditional LED lighting. However, irradiation with a high-powered blue laser will inevitably cause significant thermal attack, which places a high demand on phosphor converters as well as on device architecture. In this work, a proof-of-concept prototype of near-infrared laser-driven upconversion solid-state-lighting is proposed. Robust lanthanide doped /-NaYF4 embedded glass ceramics are developed as upconverted color converters and a routine 980 nm laser is used as the pumping source for its relatively low thermal effect and perfect resonance with Yb3+ sensitizers. Stable and bright upconversion white light is indeed produced by coupling a Yb/Tm/Er doped -NaYF4 glass ceramic with a 980 nm laser, but the luminous efficiency and energy efficiency are only 0.3 lm W-1 and 0.12%, respectively, owing to low Er doping concentration. As an alternative, a stacking structure of Yb/Tm doped and Yb/Er doped glass ceramics is designed as a color converter to improve the luminous efficiency up to 1.0 lm W-1 and energy efficiency up to 0.5% under a laser power density of 275 W cm(-2). It is believed that this research will provide a new idea for laser lighting and open up the application field of glass ceramics.
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