All‐Inorganic Functional Phosphor–Glass Composites by Light Curing Induced 3D Printing for Next‐Generation Modular Lighting Devices

Abstract

Digital light processing 3D printing and pressureless sintering are combined to construct color‐tunable all‐inorganic functional composites by a simple and general strategy. The insertion of Y3Al5O12:Ce (YAG:Ce) into silica glass (YAG:Ce‐PiSG) is realized by pressureless sintering based on silica nanocomposites for 3D printing, which effectively controls the intense interface reaction between phosphor and substrate. The chromaticity of YAG:Ce‐PiSG‐based white light‐emitting diodes (WLEDs) shifts from blue‐white to white and yellow, and the 3D‐printed dome structure aids in the heat dissipation and pump blue light utilization. In addition, a series of red‐emitting color converters (CASN:Eu‐PiBSG) are synthesized by cofiring CaAlSiN3:Eu (CASN:Eu) with low softening‐point borosilicate glass powders, overcoming the fatal drawback of inherently low thermal performance. The chromaticity of integrated YAG:Ce‐PiSG/CASN:Eu‐PiBSG‐based WLEDs benefiting from 3D printing technology is adjusted in the color range from cold white to warm white. A warm WLED with high luminous efficiency (92.6 lm W−1) and excellent color rendering index (90.2) is successfully assembled. The 3D printed customizable phosphor–glass composites offer a great potential to develop high‐power and color‐tunable WLEDs, which are also of great significance for developing innovative glass composites with high‐temperature stability.

Chromaticity-Tunable All-Inorganic Color Converters Fabricated by 3D Printing for Modular Plant Growth Lighting Devices

“…Printing inks with 60, 65, and 70 wt % solid loadings result from the addition of light-cured resin and the NZSB glass powders described above with low softening points. Light-cured resin was prepared following our previous works, 55 and 10 wt % resin from Genesis, Tethon 3D, was used to enhance the photosensitivity of the ink. The obtained glass powders were added to the light-curing resin several times and further mixed at 1500 rpm for 30 min in a planetary ball mill to prepare uniform printing inks.…”

Rational Design of Nitride Phosphor-In-Glass with Robust Stability and Photoluminescence Performance

“…To address the issue of aging-induced discoloration in organic resin phosphor-in-silicone (PiS) encapsulation, three distinct solutions have been proposed, namely single crystals, transparent ceramics, and phosphor-in-glass (PiG). − However, both single crystals and transparent ceramics are encumbered by complexities and elevated costs in their preparation. PiG has garnered substantial attention for its cost-effectiveness, straightforward synthesis, and capacity for color adjustment.…”

Crystal field optimization and fluorescence enhancement of a Mn4+-doped fluoride red phosphor with excellent stability induced by double-site metal ion replacement for warm WLED

“…Phosphor-converted white light-emitting-diodes (pc-WLEDs), as a new solid-state lighting source, process several desirable advantages, such as high luminous efficiency, splendid luminescence tuning, long operation lifetime, and low power consumption, and are rapidly replacing the traditional light sources for indoor lighting, such as fluorescent and incandescent lamps. 1–5 The commercial WLEDs can be fabricated by blue-emitting LED chip (InGaN) and green-yellow phosphors (Y 3 Al 5 O 12 :Ce 3+ ). 6,7 However, as WLEDs for household lighting, the color quality of white light is not as ideal as people expect, which shows low color rendering index (CRI < 80) 8,9 and high correlated color temperature (CCT > 4500 K), 10 and its light effect is far less than that of sunlight.…”