Ba 3 P 4 O 13 :Eu 3+ phosphors with high thermal stability and high internal quantum efficiency for near-ultraviolet whi
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Ba3P4O13:Eu3+ phosphors with high thermal stability and high internal quantum efficiency for near-ultraviolet white light-emitting diodes Peng Du1,2 · Jae Su Yu1 Received: 22 November 2018 / Accepted: 5 January 2019 © Springer-Verlag GmbH Germany, part of Springer Nature 2019
Abstract 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 E u3+ ions in the B a3P4O13 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.
1 Introduction With the increase of awareness of global electricity consumption and climate issues, much attention has been drawn to search for a new high-efficient lighting source. In comparison with the conventional incandescent and fluorescent lamps, the phosphor-converted white light-emitting diodes (WLEDs) were regarded as a next-generation white light source for artificial lighting because of its satisfactory advantages including long operation lifetime, high luminous efficiency, eco-friendly feature, and low-energy consumption [1–3]. Nowadays, the most popular route, which is applied to realize the WLEDs, is the combination of Y3Al5O12:Ce3+ yellow-emitting phosphors with an InGaN blue chip. Nevertheless, this strategy can only generate cool white light with low color rendering index (CRI) and high correlated color temperature (CCT) due to the shortage of the red-emitting component in the luminescent spectrum, which makes it far * Jae Su Yu [email protected] 1
Department of Electronic Engineering, Kyung Hee University, Yongin‑si, Gyeonggi‑do 17104, Republic of Korea
Department of Microelectronic Science and Engineering, Ningbo University, Ningbo 315211, China
2
away from the optimal requirements in the market [4–6]. Considering these drawbacks, the integrating hybrid (red, green, and blue) phosphors and a near-ultraviolet (NUV) chip were proposed to produce the warm white light [7, 8]. From these above schemes, one knows that it is indispensable to seek a new red-emitting phosphor that can be eithe
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