Abstract
Exploring outstanding rare-earth activated inorganic phosphors with good thermostability has always been a research focus for high-power white light-emitting diodes (LEDs). In this study, we report a Sm3+-activated KNa4B2P3O13 (KNBP) powder phase. Its particle morphology, photoluminescence properties, concentration quenching mechanism, thermal quenching mechanism, and chromatic properties are demonstrated. Upon the near-ultraviolet (NUV) irradiation of 402 nm, the powder phase exhibits orange-red visible luminescence performance, originating from typical 4G5/2→6HJ/2 (J = 5, 7, 9) transitions of Sm3+. Importantly, the photoluminescence performance has good thermostability, low correlated color temperature (CCT), and high color purity (CP), indicating its promising application in the NUV-pumped warm white LEDs.
Highlights
To support the field of solid-state lighting and display, developing a variety of inorganic phosphors suitable for white light-emitting diodes (LEDs) has increasingly attracted a tremendous attention [1,2,3]
The X-ray diffraction (XRD) patterns for all Sm3+-doped samples have the same peak positions and relative intensities as the simulated one, revealing that all the prepared powder phases are isostructural with the KNBP orthorhombic matrix and belong to the non-centrosymmetric space group Pna21
The coordination number (CN)-dependent radius values for K+, Na+, B3+, P5+, and Sm3+ ions are listed in Table S1 in the Electronic Supplementary Material (ESM) [19]
Summary
To support the field of solid-state lighting and display, developing a variety of inorganic phosphors suitable for white light-emitting diodes (LEDs) has increasingly attracted a tremendous attention [1,2,3]. An LED inorganic phosphor is composed of activator and host material. Rare-earth ions, as important activators, can acquire various emission light colors (blue, green, yellow, and red) owing to their abundant 4f transition properties [6,7]. The symmetry of the coordination field for Sm3+ ions closely affects the luminescence efficiency and emission light color of inorganic phosphors. The diversified structures of borophosphate materials give a great probability for exhibiting the different emission light colors of Sm3+ related to the diversity of its coordination fields. The borophosphate KNBP exhibits a good transmittance in the whole visible light region. It has the characteristics of stable physicochemical properties, facile preparation, and nontoxicity. The phase identification, morphological characterization, photoluminescence properties, chromatic properties, concentration quenching, and thermal quenching mechanisms were systematically analyzed
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