The invention discloses Ce: YAG
microcrystalline glass and application thereof in a white-light LED. The
microcrystalline glass is prepared from the following raw materials in mole percentage: 19-24% of Y2O3, 33-39% of Al2O3, 28-40% of SiO2, 4-5% of ZrO2 and 3-5% of a
fluoride nucleation agent; the preparation method of the
microcrystalline glass comprises the following steps: (1) mixing glass materials; (2) melting glass materials, namely heating the glass materials in a
crucible by virtue of a high-temperature resistant furnace, melting at a temperature is 1600-1700 DEG C, preserving heat for 2-5hr, pouring a glass melt on a
cast iron mould, then annealing the glass melt in a high-temperature furnace, preserving heat at
glass transition temperature Tg for 2-5hr and cooling with the furnace to 50 DEG C; turning off the power supply of the high-temperature furnace, automatically cooling to
room temperature and taking out glass; and (3) carrying out insulation treatment, namely carrying out heat treatment on the glass in a precision annealing furnace at 1200-1400 DEG C for 1-10hr, cooling with the furnace to 50 DEG C, turning off the power supply of the precision annealing furnace, and automatically cooling to
room temperature so as to obtain the semitransparent Ce: YAG microcrystalline glass.