A novel red-emitting Sr7Sb2O12:Eu3+, M+ (M = Li, Na, K) phosphor for warm white LED: synthesis, optical properties, and LED fabrication
Source abstract
Abstract
Novel red phosphors Sr7Sb2O12:Eu3+ and Sr7Sb2O12:Eu3+, M+ (M = Li, Na, K) were synthesized via a high temperature solid-state method and their luminescent properties were investigated to figure out the promising application in warm white light-emitting diodes (LED). The phase structure, crystal morphology, luminescence properties, luminescence decay lifetime, thermal stability and chromaticity coordinate of the as-synthesized phosphors were investigated in detail. Sr7Sb2O12:Eu3+ could be efficiently excited by the near-ultraviolet (UV) light and exhibited bright red emission around 612 nm. When co-doped with the charge compensation M+ (M = Li, Na, K) ions, the emission intensity of Eu3+ can be enhanced to some extent. The optimal Eu3+ doping concentration was determined to be about x = 0.2 and concentration quenching mechanism in Sr7Sb2O12:Eu3+ sample was attributed to the electric dipole–dipole interaction. The temperature-dependent spectra of Sr7Sb2O12:Eu3+ implied that this sample shows good thermal-stable properties. The decay lifetime of Sr7Sb2O12:0.2Eu3+ was about 1.44 ms. Combining with the red Sr7Sb2O12:0.20Eu3+, blue BaMgAl10O17:Eu2+, yellow (Ba,Sr)2SiO4:Eu2+ phosphor and a 395 nm near-UV LED chip, a white LED with low correlated color temperature (CCT = 4260 K) and high-color rendering index (Ra = 91.8) was fabricated. The overall work suggested that Sr7Sb2O12:Eu3+ phosphor is a promising red-emitting component applied in warm white LED.
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Research context
OpenAlex topics: Luminescence Properties of Advanced Materials · Perovskite Materials and Applications · Radiation Detection and Scintillator Technologies
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (37)
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