Solid-state white-light-emitting diodes (WLEDs) have attracted more and more attention for its long lifetime, high efficiency, low cost, and environment-friendly relative to incandescent and fluorescent of traditional lighting. 1−4 At present, the white light of commercial WLED is mainly obtained through the combination of blue InGaN chip and Y 3 Al 5 O 12 :Ce 3+ (YAG:Ce 3+) yellow phosphor. Due to the deficiency of red emission, the inherent disadvantages of these WLEDs, such as low color rendering index (CRI, Ra<80) and high color temperature (CCT>6000K), limit their application in illuminating system. 5−8 Fortunately, some red-emitting phosphors that can be added directly to commercial WLED to improve the quality of LEDs have been developed. The non-rare-earth ion Mn 4+ has attracted our attention because its emission peak is located in the red region of 620 to 750 nm under blue and ultraviolet light excitation. 9−11 Among the Mn 4+-doped red phosphors, the emission peak of the Mn 4+-doped fluoride is located at 620 to 640 nm due to the weak coordination bond. In recent years, various Mn 4+activated fluoride phosphors such as A 2 XF 6 :Mn 4+ (A = K, Na, Cs, etc X = Si, Ge, Ti, etc) are gradually replacing the Eu 2+-doped nitride as red phosphors for manufacture the WLEDs because of their superior thermal stability, optical properties, and facile synthetic condition. 12−18

Fish processing and handling operations lead to the generation of much waste, including viscera, scales, fins and bones, which poses a serious risk to the environment (Xavier et al., 2017). Global fish waste (FW) generation per year is around 75.24 megatons. (Shanthi et al., 2021). Exploring processes for producing food from FW will lead to more effective management of FW and help meet the goals of a circular bio-economy. Murthy et al. suggested that viscera from little tuna (Euthynnus affinis), catla (Catla catla), and tilapia (Oreochromis mossambicus) can be used to obtain a high value-added product, proteolytic enzymes, which would also reduce the amount of waste from the fishing industry (Murthy, Phadke, Unnikrishnan, 2018). Fish Marine bioactive peptides (FMBP) are peptides with specific physiological functions prepared by enzymatic digestion, separation and purification of protein raw materials (Guo et al., 2014).