14436
Y ( 2 ) Ti ( 2 ) O ( 7 ) ( YTO ) and Er ( 3 + ) / Yb ( 3 + ) co - doped Y ( 2 ) Ti ( 2 ) O ( 7 ) ( EYYTO ) phosphors have been prepared by solid - state reaction method .
 Chemical: Y ( 2 ) Ti ( 2 ) O ( 7 ); Chemical: YTO; Chemical: Er ( 3 + ); Chemical: Yb ( 3 + ); Chemical: Y ( 2 ) Ti ( 2 ) O ( 7 ); Chemical: EYYTO
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: Y ( 2 ) Ti ( 2 ) O ( 7 ), YTO, Er ( 3 + ), Yb ( 3 + ), Y ( 2 ) Ti ( 2 ) O ( 7 ), EYYTO 
Answer:
 Chemical: Y ( 2 ) Ti ( 2 ) O ( 7 ); Chemical: YTO; Chemical: Er ( 3 + ); Chemical: Yb ( 3 + ); Chemical: Y ( 2 ) Ti ( 2 ) O ( 7 ); Chemical: EYYTO