▎ 摘　　要

NOVELTY - Fluorescent ceramic substrate comprises 2-3 pts. wt. silicon carbide, 1-2 pts. wt. cerium oxide, 1-2 pts. wt. graphene, 30-40 pts. wt. aluminum oxide, 4-7 pts. wt. yttrium oxide, 3-6 pts. wt. citric acid, 3-5 pts. wt. ethylenediamine, 15-20 pts. wt. deionized water, 1-2 pts. wt. talc, 2-3 pts. wt. ethyl orthosilicate, 1-2 pts. wt. magnesium oxide, 30-40 pts. wt. ethanol, 5-10 pts. wt. silica powder and 15-20 pts. wt. silane coupling agent KH550. USE - The fluorescent ceramic substrate is useful in high power light emitting diode (claimed). ADVANTAGE - The fluorescent ceramic substrate has good compression performance (claimed); and has excellent tensile and compressive strength, abrasion resistance, and large heat conducting coefficient. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing fluorescent ceramic substrate comprising (i) taking citric acid as carbon source, adding ethylenediamine and deionized water, placing at 150-250 degrees C for 3-7 days to obtain blue light emission, green light emission and red light emitted liquid carbon point fluorescent material under excitation of ultraviolet light, (ii) adding silica powder, graphene and silicon carbide into the liquid obtained in step (ii), then adding silane coupling agent KH550, performing ultrasonic dispersion for 10-30 minutes, soaking for 3-5 hours, filtering, washing to obtain mixture of adsorbed carbon dot fluorescent materials, (iii) adding mixture of cerium oxide, aluminum oxide, yttrium oxide, talc and step (i) into the ball mill and adding ethyl orthosilicate, magnesium oxide and ethanol, mixing for 8-15 hours, placing slurry at 80-120 degrees C in drying oven, and (iv) sieving product of step (iii) and cold isostatically pressed to form green body and then transferring to a vacuum furnace, insulating at 1650-1850 degrees C for 20 hours to obtain transparent sample in order to eliminate internal stress and oxygen vacancies, introducing during the vacuum sintering process, annealing samples in air atmosphere of 1380-1500 degrees C for 15-25 hours.