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Low-energy Cathodoluminescence for OxyNitride Phosphors
Published on: November 15, 2016
Blue light-excited zero-thermal-quenching near-infrared garnet CaY2Sc2Al2SiO12:Cr3+/Yb3+ phosphors for pc-LED
Zhichao Ren1, Hongquan Yu1, Xin Tong1
1Department of Physics, Dalian Maritime University, Dalian 116026, Liaoning, China.
Abstract:
The thermal stability of near-infrared (NIR) phosphors presents a significant challenge that must be addressed for their successful application in NIR light sources. The match between the activated ions and the structure of the host is closely associated with the luminescent thermal stability. In this work, we report a new CaY2Sc2Al2SiO12:Cr3+/Yb3+ (CYSASO:Cr3+/Yb3+) phosphors with zero thermal quenching of the luminescence intensity in the range of 303-423 K. The internal quantum efficiency (IQE) of CYSASO:Cr3+/Yb3+ phosphors increases from 61.62 % to 71.49 % compared with that of CaY2Sc2Al2SiO12:Cr3+(CYSASO:Cr3+) phosphors, which is due to the addition of Yb3+. The NIR phosphor-converted light-emitting diodes (pc-LEDs) based on the CYSASO:Cr3+/Yb3+ phosphors package have a photoelectric efficiency of 5.95 %@20 mA driving and an output power of 123.01 mW@1000 mA. The pc-LEDs based on the CYSASO:Cr3+/Yb3+ phosphors shows excellent application prospects in the field of night vision imaging. This novel CYSASO host material provides a new window for addressing the poor thermal stability commonly observed in NIR phosphors.
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