Ba3P4O13:Eu3+ phosphors with high thermal stability and high internal quantum efficiency for near-ultraviolet white light-emitting diodes
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The studied samples, which were sintered by a sol–gel technique, can be efficiently pumped by the near-ultraviolet light and emitted bright red light arising from the 4f–4f transitions of Eu3+ ions. Besides, color coordinate and internal quantum efficiency of the synthesized phosphors were determined to be (0.621, 0.378) and 71.2%, respectively. The optimum doping concentration for the Eu3+ ions in the Ba3P4O13 host lattices was revealed to be 10 mol% and the concentration quenching mechanism was dominated by electric-dipole interaction. By a facile method utilizing the Judd–Ofelt theory, the intensity parameters were calculated to analyze the local crystal environment surrounding the Eu3+ ions in the Ba3P4O13 host lattices. Furthermore, the temperature-dependent PL emission spectra confirmed that the studied compounds still remained 80.7% of its initial PL emission intensity at room temperature, indicating its excellent thermal stability. Ultimately, a light-emitting diode device, which can emit bright white light with proper correlated color temperature (CCT = 6727 K) and color rendering index (CRI = 73.2) values, was packaged to explore the feasibility of the final products for indoor illumination applications.
This work was supported by the National Research Foundation of Korea (NRF) Grant funded by the Korea government (MSIP) (no. 2017R1A2B4011998 and no. 2018R1A6A1A03025708).
- 31.G. Blasse, Philips Res. Rep. 24, 131 (1969)Google Scholar