A high efficient and anti-thermal dual-emission blue-green phosphors for warm white LEDs
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A high efficient and anti‑thermal dual‑emission blue‑green phosphors for warm white LEDs Dong Liu1 · Yahong Jin1 · Guangting Xiong1 · Yang Lv1 · Haoyi Wu1 · Guifang Ju1 · Li Chen1 · Zhengfa Hu1,2 · Yihua Hu1,2 Received: 4 May 2020 / Accepted: 11 August 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract A series of broadband blue-green phosphors Rb0.5+yNa1.5−y(Li3SiO4)2:xEu2+ (0 ≤ y ≤ 0.4, 0.01 ≤ x ≤ 0.08) were synthesized by the high-temperature solid-state reaction. The powder X-ray diffraction was employed to explore the crystal structural evolution from RbNa3(Li3SiO4)4 to RbNa(Li3SiO4)2 with the increasing of Rb+. The spectra show the optimized composition was determined as y = 0.4. The luminescence, lifetime decay curves and thermal steadily spectra of R b0.9Na1.1(Li3SiO4)2:xEu2+ 2+ phosphors were investigated in detail. The phosphor of R b0.9Na1.1(Li3SiO4)2:Eu shows suitable visible spectra (450–550 nm, cover the blue and green regions), excellent thermal quenching (104%@150 °C of the initial integrated intensity at room temperature under 396 nm excitation) and broad excitation spectrum (320–450 nm). Finally, a commercial near-UV LED devices (395 nm) were fabricated with the Rb0.9Na1.1(Li3SiO4)2:Eu2+ phosphor as blue-green and commercial red phosphor CaAlSiN3:Eu2+ with a warm color temperature of 3104 K and a color rendering index of 91.8. This result indicated that Rb0.9Na1.1(Li3SiO4)2:Eu2+ may be a promising blue-green phosphor for indoor lighting. Keywords Blue-green phosphor · Thermal steadily · Energy competition · wLEDs
1 Introduction With the rapid development of economy and technology, the energy consumption is increasingly intensified, so it is urgent to apply the energy-efficiency production to replace energywasting tradition light sources [1]. Compared with the traditional light sources, the white light-emitting diodes (wLEDs) show a series of unique merits such as high efficiency, low energy consumption, long lifetime and environment friendliness [2]. Meanwhile, the improvement and maturity of Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00339-020-03904-9) contains supplementary material, which is available to authorized users. * Yahong Jin [email protected] * Yihua Hu [email protected] 1
School of Physics and Optoelectronic Engineering, Guangdong University of Technology, WaiHuan Xi Road, No. 100, Guangzhou 510006, China
Synergy Innovation Institute for Modern Industries of Dongyuan and GDUT, Heyuan 517025, China
2
UV-LED chip (with the wavelength of 380–420 nm) and blue-LED chip (with the wavelength of 450–480 nm) technology accelerate this transformation. Therefore, the novel phosphors with high emission efficiency, excellent thermal steadily and luminescent properties play an increasing important role in wLEDs, not the chip [3, 4]. Nowadays, phosphor-converted wLEDs are mainly fabricated by 3 technologies. The mainstream wLEDs are fabricated by combining with a blue InGaN LED chip and YAG:Ce3+ (
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