本发明提供了一种荧光物质及其所制成的发光装置。该荧光物质的组分为xABmOn·y(aAl2O3·bAlN)，其中，A选自Ca、Sr、Ba、Mg、Zn、Mn、Si元素中的两种或两种以上的组合，且必含Mn元素，B选自Al、B、Ga元素中的一种或两种以上的组合，且1.8≤m≤2.2，3.5≤n≤4.5，0.5≤x≤1，0.22≤b≤0.35，x+y＝1，a+b＝1。本发明的荧光物质可在400～470nm激发下，发出510‑540nm之间的绿光，且色纯度高，有望满足高色域液晶显示用白光LED装置的应用需求。

The invention provides a fluorescent substance and a light-emitting device prepared from the same.The component of the fluorescent substance is xABmOn.y(aAl2O3.bAlN), wherein A is a combination of two or more selected from elements of Ca, Sr, Ba, Mg, Zn, Mn and Si and must contain the Mn element, B is one or a combination of more than two selected from elements of Al, B and Ga, m is greater thanor equal to 1.8 and less than or equal to 2.2, n is greater than or equal to 3.5 and less than or equal to 4.5, x is greater than or equal to 0.5 and less than or equal to 1, b is greater than or equal to 0.22 and less than or equal to 0.35, x+y is equal to 1, and a+b is equal to 1. The fluorescent substance can emit green light within 510-540 nm under the excitation within 400-470 nm, in addition, the color purity is high, and the application requirements of the white LED device for high-color-gamut liquid crystal display are expected to be met.