Development of sialon phosphors and their applications to solid-state lighting

Abstract

InGaN-LED-driven solid-state lighting [i.e., white light-emitting diodes (wLEDs)] is now penetrating to our daily life and replacing traditional lighting sources rapidly owing to its energy-saving, high efficiency and environment friendly. Phosphors play key roles in improving the color rendition/gamut, luminous efficiency and lifetime of wLEDs, but the traditional ones for lamps usually do not meet the requirements for wLEDs. This triggers the search for new phosphors that can be excited by blue-or near ultraviolet LEDs. Sialon-based nitride phosphors are emerged as a new family of luminescent materials, superior to oxide or sulfide counterparts in terms of high conversion efficiency, small Stokes shift, excellent chemical and thermal stability. In this mini review, nitride phosphors will be introduced, including their classification, photoluminescence properties, structure-property relations, and applications in general illumination and backlighting.

The Fundamental Disorder Unit in (Si, P)−(O, N) Networks

“…The most prominent example is the emission maxima but also the nature of the luminescence such as brightness and decay time or even absence can indicate structural features to look out for, as we will see below. In our work, we found that Sr 3 SiP 3 O 2 N 7 (1) shows green emission at first glance, Sr 5 Si 2 P 6 N 16 (2) shows orange emission, Sr 5 Si 2 P 4 ON 12 (3) shows very weak yellow to orange emission, and Sr 16 Si 9 P 9 O 7 N 33 (4) shows no visible emission when irradiated with ultraviolet light. This is also reflected in the corresponding PLE and PL measurements shown in Figure 6a.…”

“…Second, the calculated values of the Ewald summation, CHARDI, and BVS agree very well with what we expect. This would not be the case if we assumed a wrong substitutional order of our networks, as we have shown in previous work for Sr 5 Si 2 P 6 N 16 (2). [8] Finally, according to our definition, all networks with total deviations of 0.9-1.8 % are congruent.…”

“…In our case, we want to use the well‐established compound class of alkaline earth and rare earth metal SiAlONs (silicon aluminum oxonitrides) to introduce the new class of alkaline earth oxonitridosilicate phosphates, or rather SiPONs. Their striking similarities serve not only as motivation to investigate such compounds in view of the diverse applications of SiAlONs, but also to facilitate the understanding of their rather complex structures [1,2] . SiAlONs are generally characterized by a tetrahedral network spanned by Al 3+ and Si 4+ as network‐forming cations (NFC) and N 3− and O 2− as ligands.…”

The Fundamental Disorder Unit in (Si, P)−(O, N) Networks

“…Their striking similarities serve not only as motivation to investigate such compounds in view of the diverse applications of SiAlONs, but also to facilitate the understanding of their rather complex structures. [1,2] SiAlONs are generally characterized by a tetrahedral network spanned by Al 3 + and Si 4 + as network-forming cations (NFC) and N 3À and O 2À as ligands. Although these networks can be neutral, we will only focus on anionic SiAlONs since the presented SiPONs include Sr 2 + as a counter cation.…”

Preparation, Photochromism, and Luminescence Principle of BMS: Dy3+, Eu3+ Ceramics

“…[7] The color of most metal oxides is usually blue, such as V 2 O 5 [8][9][10][11] and WO 3 , [12][13][14][15] which can have luminescent properties by doping with other element to form germanate based phosphor, phosphate based phosphor, stannate based phosphor, titanate based phosphor, and borate based phosphor. [16][17][18] Barium magnesium silicate (BMS)-based phosphors are inorganic phosphors that have a long history and promising applications in many emerging fields. [19][20][21][22][23] The team of Kunming University of science and technology found that the photochromism and Photoluminescence of BaMgSiO 4 : Bi 3+ ceramics can meet the requirements of optical storage media.…”