Luminescent thermal stability and electronic structure of narrow-band green-emitting Sr-Sialon:Eu2+ phosphors for LED/LCD backlights
2019
Abstract Stable and high-efficiency narrow-band green phosphor is a key component for wide color gamut liquid crystal display (LCD) backlights. In this paper, narrow-band green-emitting Sr 3-3x Si 13 Al 3 O 2 N 21 :3xEu 2+ (0.001 ≤ x ≤ 0.09) (Sr-Sialon:Eu 2+ ) phosphor with a full-width at half maximum of 66 nm has been successfully synthesized by using the solid-state reaction method. All the samples are the pure phase with Sr 3 Si 13 Al 3 O 2 N 21 -type structure. Their emission band maximum can be tuned from 495 to 523 nm by increasing Eu 2+ content. The compound with x = 0.03 possesses the highest luminescence intensity with the peak position around 510 nm. Luminescent thermal stability gets better with Eu 2+ concentration decreasing. The integrated intensity of the sample with x = 0.01 at 425 K remains about 80% of the intensity at room temperature. The host referred binding energy (HRBE) and vacuum referred binding energy (VRBE) schemes are constructed to further explain its luminescent thermal quenching mechanism. White light-emitting-diode ( w -LED) device using optimized Sr 2.91 Si 13 Al 3 O 2 N 21 :0.09Eu 2+ phosphor demonstrates its potential application for LCD backlights.
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