Abstract
In this work, an aluminate silicate garnet phosphor, Y2Mg2Al2Si2O12:Ce3+ (YMASG:Ce3+), exhibiting strong and broad yellow-orange emission, was successfully synthesized. Attributed to the double cation substitution of YAG:Ce3+, which led to a compression effect, a redshift was observed with respect to YAG:Ce3+. More importantly, a transparent phosphor-in-glass (PiG) sample was obtained by incorporating the phosphor YMASG:Ce3+ into a special low-melting precursor glass. The energy dispersive spectrometer (EDS) mapping analysis of the as-prepared PiG sample indicates that YMASG:Ce3+ was successfully incorporated into the glass host, and its powders were uniformly distributed in glass. The photoluminescence intensity of the PiG sample was higher than that of the powder due to its relatively high thermal conductivity. Additionally, the combination of the PiG sample and a blue high-power chip generated a modular white LED with a luminous efficacy of 54.5 lm/W, a correlated color temperature (CCT) of 5274 K, and a color rendering index (CRI) of 79.5 at 350 mA.
Highlights
In past decades, scientists and engineers have been interested in white light-emitting diodes (w-LEDs) because of their extremely long life and high energy efficiency relative to conventional lighting sources [1,2,3]
Sample prove that YMASG:Ce3+ was successfully incorporated into the glass host and the particles were uniformly distributed in glass
It is clear that the crystal structures of the samples crystallized in the garnet structure
Summary
Scientists and engineers have been interested in white light-emitting diodes (w-LEDs) because of their extremely long life and high energy efficiency relative to conventional lighting sources [1,2,3]. The problem of red deficiency remains, so such white LED devices have been unable to meet the demand for high-quality lighting sources. To improve the CRI, one or more phosphors (green or red) were mixed with YAG:Ce3+ , and a multicolor emitting PiG was obtained by incorporating the phosphors into a glass frit. Aiming to tune the CCT and CRI of YAG:Ce3+ PiG-based LED devices, novel phosphors emitting red-rich light are in demand. Y2 Mg2 Al2 Si2 O12 :Ce3+ (YMASG:Ce3+ ) via the double substitution of Mg2+ –Si4+ for Y3+ –Al3+ in the YAG:Ce3+ host lattice This substitution gives rise to the change of the crystal field, following with a redshift in the emission band. This study provides a strategy based on local structure correlation to obtain phosphors with good thermal stability for warm w-LEDs
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