在近几年中,稀土元素(镧、铈、镨、钕、钷、钐、铕、钆、铽、镝、钬、铒、铥、镱、镥)及钇的特殊用途范围有很大发展。目前稀土燐光体用于能量可节约的荧光灯及 X 射线屏并且还用于采色电视管。通用电气公司及西屋公司所共同生产的新式荧光灯中,所用的燐光体之一是二价铕。X 射线屏中的稀 In recent years there has been a great development in the special use of rare earth elements (lanthanum, cerium, praseodymium, neodymium, acenaphthene, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, gallium, ytterbium, gallium) and yttrium. Rare earth phosphors are currently used for energy-saving fluorescent lamps and X-ray screens and also for color television tubes. Among the new fluorescent lamps commonly manufactured by General Electric and Westinghouse, one of the coffers used is divalent europium. X-ray screen in the thin