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Low-energy Cathodoluminescence for OxyNitride Phosphors
Published on: November 15, 2016
Ambient-stable Mg2+-doped Cs3Cu2I5 nanocrystals with enhanced photoluminescence for color conversion blue LEDs
Abstract:
We successfully synthesized Mg2+-doped Cs3Cu2I5 nanocrystals (NCs) under ambient conditions. The 10% Mg2+-doped Cs3Cu2I5 NCs exhibit significantly enhanced optical properties, achieving a photoluminescence quantum yield (PLQY) of 25.80% and a narrow emission full width at half maximum (FWHM) of 78 nm. The 10% Mg2+-doped NCs also exhibited improved thermal and water stability, retaining 67% of their initial photoluminescence (PL) intensity when heated from 25°C to 100°C and maintaining blue light emission after 30 min in aqueous environments. When integrated into a color conversion LED, these NCs achieved simultaneous improvements in emission characteristics, showing a narrowed FWHM (81 nm) and higher emission efficiency compared to undoped counterparts.
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03:02Colors and Magnetism
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
01:14Photoluminescence: Applications