White light emission of wide‐bandgap silicon carbide: A review

Abstract

White light-emitting diodes (LEDs) are the most promising alternative to the conventional lighting sources due to their high efficacy and energy saving in illumination. Silicon carbide (SiC) has a wide optical bandgap and could be tailored to emit light at different wavelengths across the entire visible spectrum by introducing different dopants. Donor and acceptor (DA) co-doped fluorescent SiC (f-SiC) is a potential candidate for replacing phosphor material in white LEDs, as it has been observed as a good wavelength converter overcoming the disadvantages of rare earth-containing phosphors, such as poor color-rendering index (CRI), short lifetime, and short degradation time. The current study attempts to present an overview on the available approaches to fabricate f-SiC for generating the white light emission and challenges in fundamental research issues to enhance quantum efficiency, color rendering performance, stability, reproducibility of color quality, and lifetime of f-SiC.

Enhancing luminous flux and color rendering of laser-excited YAG:Ce3+ single crystal phosphor plate via surface roughening and low-temperature sintering a CaAlSiN3:Eu2+ phosphor-in-borate glass

“…1(a) displays the preparation process of YAG:Ce 3+ SCPs by using the Czochralski method. The detailed procedure are list as follows: (1) weighing the commercial raw materials with a high purity of 99.99%:…”

“…Phosphor-converted white light-emitting diodes (pc-WLEDs) are solid-state lighting devices composed of LED chip and converted phosphor and widely used in many fields because of their high efficiency, long life, and ease of production [1,2]. However, efficiency droop [3] occurs in LED dies, which drastically reduces internal quantum efficiency (IQE) under high driven current.…”

“…Excessive optical density will cause the thermal quenching and carbonization of phosphor/silicone composites [11]. Thus, the color converter used in pc-WLD should satisfy the requirements, such as: (1) high thermal stability, (2) high thermal conductivity, (3) high optical conversion efficiency and (4) high luminance saturation threshold. Currently, the types of laser-excited phosphor include single crystal phosphor (SCP) [12][13][14], ceramic phosphor [15][16][17], and phosphor-in-glass (PiG) [18][19][20].…”

Experimental characterization of the thermo-optic coefficient vs. temperature for 4H-SiC and GaN semiconductors at the wavelength of 632 nm

“…To date, SiC has already been explored to make a variety of photonic devices, including light-emitting diodes (LEDs) 9 , 10 , photodiodes 11 , 12 and, more important, for the design and fabrication of integrated photonic circuits thanks to the possibility of realizing low-loss waveguides 13 leading to optically active devices, such as modulators 14 , 15 or micro-ring resonators 16 . SiC has been shown to be compatible with Silicon (Si) processing technology, which means that it can be integrated with other Si-based photonic devices and circuits 17 .…”

Digital Predictive Current-Mode Control for Asymmetrical Half-Bridge LED Constant-Current Driver

“…LED light source has numerous advantages such as high efficiency, energy saving, long life, high reliability, and environmental friendliness, thus being widely used in indoor and outdoor lighting [1]. Furthermore, with the continuous improvement of LED's light flux and efficiency, the application of LED light sources has been rapidly expanded into high-power lighting fields such as street lamps, square lightening, airport lightening, stadium lightening, and searchlights in an all-around way [2,3].…”