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A year and a half ago Ritek invested in the production of OLED ( organic light - emitting diode ) displays , which is yet another technology used in portable computing devices that relies on thin opto - electrical film application techniques .
 date: A year and a half ago; organization: Ritek
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: date, organization, person, geographical social political, national religious political, facility, cardinal, location, work of art, law, event, product, ordinal, percent, time, quantity, money, language 
Text: {0} 
 Entities: A year and a half ago, Ritek 
Answer:
 date: A year and a half ago; organization: Ritek