Sr[Li2Al2O2N2]:Eu2+—A high performance red phosphor to brighten the future

Abstract

Innovative materials for phosphor converted white light-emitting diodes are in high demand owing to the huge potential of the light-emitting diode technology to reduce energy consumption worldwide. As the primary blue diode is already highly optimized, the conversion phosphors are of crucial importance for any further improvements. We report on the discovery of the high performance red phosphor Sr[Li 2 Al 2 O 2 N 2 ]:Eu 2+ meeting all requirements for a phosphor’s optical properties. It combines the optimal spectral position for a red phosphor, as defined in the 2016 Research & Development-plan of the United States government, with an exceptionally small spectral full width at half maximum and excellent thermal stability. A white mid-power phosphor-converted light-emitting diode prototype utilising Sr[Li 2 Al 2 O 2 N 2 ]:Eu 2+ shows an increase of 16% in luminous efficacy compared to currently available commercial high colour-rendering phosphor-converted light-emitting diodes, while retaining excellent high colour rendition. This phosphor enables a big leap in energy efficiency of white emitting phosphor-converted light-emitting-diodes.

A Double‐Band Emitter with Ultranarrow‐Band Blue and Narrow‐Band Green Luminescence

“…Suitable for this purpose would be the red‐emitting Sr[LiAl 3 N 4 ]:Eu 2+ (SLA) by Pust et al . or the brilliant red‐emitting Sr[Li 2 Al 2 O 2 N 2 ]:Eu 2+ (SALON) by Hoerder et al . Recently, red‐emitting oxide‐based phosphor Rb 3 YSi 2 O 7 :Eu was discovered by Xia et al …”

Zero‐Thermal Quenching of Mn2+ Red Luminescence via Efficient Energy Transfer from Eu2+ in BaMgP2O7

“…The effective utilization of light energy serves as one of the most convenient approaches, and solid‐state white light‐emitting diodes (LEDs) are regarded as next‐generation illumination devices because of their superior properties such as low power consumption, robustness, and eco‐friendliness . In these devices, phosphors play a vital role in converting the light from diode chips into luminescence of varying colors . However, the commercial application of such materials in LED devices is hampered by various factors, among which the thermal quenching (TQ) of luminescence is one of the most serious drawbacks .…”

Tunable lanthanide/transition metal ion‐doped novel phosphors for possible application in w‐LEDs: a review

“…The UCr 4 C 4 ‐type prototype structure, with its highly condensed structure and rigid framework, will emerge as a novel narrow‐band‐emitting phosphors with improved luminescence characteristics. The discovery of the high‐performance red phosphor Sr[Li 2 Al 2 O 2 N 2 ]:Eu 2+ (SALON) with its promising optical characteristics and high colour rendition therefore has paved a way for a big leap in the energy efficiencies of w‐LEDs …”