Abstract
The phosphor-converted warm W-LED have being rapidly developed due to the stringent requirements of general illumination. Here, we utilized a strategy to synergistically enhance the red region and emission intensity of novel Eu-activated yellow-emitting LaSiO2N phosphors. This was realized by predicting optimum crystal structure, and governing the concentration of doping ions as well as preparation temperature. By using these straight-forward methods, we were able to vary the valence to enhance the red region and improve the quantum efficiency of LaSiO2N phosphor. The warm W-LED lamp fabricated with this red region enhanced LaSiO2N:Eu phosphor exhibited high CRI (Ra = 86), suitable CCT (5783 K) and CIE chromaticity (0.33, 0.36), indicating this synergistically enhanced strategy could be used for design of yellow-emitting phosphor materials to obtain warm W-LEDs.
Highlights
The phosphor-converted warm white LEDs (W-LED) have being rapidly developed due to the stringent requirements of general illumination
The warm W-LED lamp fabricated with this red region enhanced LaSiO2N:Eu phosphor exhibited high color rendering index (CRI) (Ra = 86), suitable correlated color temperature (CCT) (5783 K) and CIE chromaticity (0.33, 0.36), indicating this synergistically enhanced strategy could be used for design of yellow-emitting phosphor materials to obtain warm W-LEDs
Spectra of the LaSiO2N:0.01Eu phosphor prepared at 1500 °C
Summary
The phosphor-converted warm W-LED have being rapidly developed due to the stringent requirements of general illumination. We utilized a strategy to synergistically enhance the red region and emission intensity of novel Eu-activated yellow-emitting LaSiO2N phosphors.
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