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³¬¼¶ÀÏ¿ì: ½ð±Ò+40, ¡ï¡ï¡ïºÜÓаïÖú 2016-11-28 17:27:33
¾¡¹ÜÈç´Ë£¬ÉÏת»»ÄÉÃ×¾§µÄÉúÎïÓ¦ÓÃÈÔÈ»ÃæÁÙÕß¾Þ´óµÄÕϰ­ºÍÌôÕ½¡£¼´ÊÇÏ¡ÍÁÉÏת»»ÄÉÃ×¾§½ÏµÍµÄÉÏת»»Ð§ÂʺͽÏСµÄÎüÊÕ½ØÃæ¡£¶øÆù½ñΪֹ£¬»ùÓÚÓ«¹âÉÏת»»µÄÌ«ÑôÄÜµç³Ø½öÏÞÓÚÔ­ÀíÐÔµÄչʾ¡£ÕâÖ÷ÒªÊÇÒòΪÏÖÓлùÓÚ 4f-4f ԾǨµÄÏ¡ÍÁÉÏת»»²ÄÁÏÎüÊÕ½ØÃæ½ÏС£¬·¢¹âЧÂʽϵͣ¨0.1%-10%£©£¬ÇÒÔÚ½üºìÍâÇøÓòµÄµÄ¼¤·¢Æ×´ø½ÏÕ­ (<100 nm)¡£

Despite these promises, the biological application for upper-conversion nanocrystals  is still facing great obstacles and challenges, among which relatively low efficiency in upper-conversion rate and relatively small cross-section area for absorption is associated with rare earth upper-conversion nanocrystals. So far fluorescence-based    upper-conversion  solar cells are still in conceptual stage. Main problems  for absorption for current 4f-4f   transition-based rare-earth  upper-conversion material, are its relatively small cross-section area, relatively low emission rate (0.1-10%), and relatively narrow  excitation bandwidth (<100nm) in the NIR region.
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