Abstract
The color-tunable GdCaAl3O7: RE3+ (RE = Eu, Tb, Eu@Tb) phosphors were synthesized via an ultrafast sol-gel auto-combustion synthesis method. The X-ray diffraction patterns confirmed the forming of GdCaAl3O7 tetragonal phase, and the scanning electron microscopy images indicated that the obtained products presented honeycomb-like structure due to the gas releasing during the auto-combustion process. The luminescent properties, concentration quenching mechanism, energy transfer mechanism, luminescent dynamics, thermal stability and product practicability of GdCaAl3O7: RE3+ (RE = Tb, Eu, Eu@Tb) phosphors were investigated systematically. All the GdCaAl3O7: RE3+ products presented the characteristic emission of doped RE3+. Using GdCaAl3O7: 50% Tb3+@3.0% Eu3+ as yellow-emitting phosphors in combination with commercial BAM: Eu2+ blue-emitting phosphors and a NUV chip can successfully package a warm white LED device with high color rendering index (CRI, 86.3) and low correlated color temperature (CCT, 3348 K) that was very suitable for near-ultraviolet light-triggered indoor illumination.
Highlights
With the enhancing of people’s awareness for protecting the environment, the studying of phosphor-converted white light emitting diodes had attracted much attention due to the eminent advantages in high luminescent efficiency, low energy consumption, superior lifetime and excellent reliability
Song et al reported the KBaGd(WO4)3 phosphors for white light emission by suitably controlling the doping ratios of Eu3+ and Tb3+ [5,24].The above results suggest that Eu3+ and Tb3+ activated phosphors are excellent candidates for solid-sate lighting
The results show that the XRD patterns of samples were in good agreement with the standard JCPDS card of GdCaAl3O7 (No 50-1807) and the diffraction peak intensity enhanced with increasing the annealing temperatures, suggesting that pure GdCaAl3O7 can be obtained above the annealing temperature of 800 °C
Summary
With the enhancing of people’s awareness for protecting the environment, the studying of phosphor-converted white light emitting diodes (pc-WLEDs) had attracted much attention due to the eminent advantages in high luminescent efficiency, low energy consumption, superior lifetime and excellent reliability. Trivalent rare-earth ions (RE3+)-doped aluminate phosphors are appropriate for light-conversion materials owing to their excellent luminescent efficiency, high chemical and thermal stability [5,7,8,11,12,13,14]. Song et al reported the KBaGd(WO4) phosphors for white light emission by suitably controlling the doping ratios of Eu3+ and Tb3+ [5,24].The above results suggest that Eu3+ and Tb3+ activated phosphors are excellent candidates for solid-sate lighting. R. 99.9%) were purchased from the Aladdin Chemical Reagent Company
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
