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µÚÒ»¾ä£ºWhile, the most commonly used method is to physically mixed phosphors: yellow/red phosphors, green/red phosphors, or green/yellow/red phosphors [5-7]. So, it¡¯s urgently needed to find novel green or red-emitting phosphor. Â¥Ö÷ÒÉÎÊ£ºÉÏÃæ¾ä×ÓÊDz»ÊÇ is to physically mixed ¸Ä³Éis to physically mix £¬È¥µômixed ºóÃæµÄed?»¹ÊÇÆäËûµØ·½ÓÐÎÊÌ⣿ µÚ¶þ¾ä£ºHowever, because the emission spectra of these phosphors absences in the red region, so YAG: Ce based white LED has a poor color rendering index (CRI). Â¥Ö÷ÒÉÎÊ£ºÕâ¾äÂ¥Ö÷Ö»·¢ÏÖbecauseºÍso µÄ´íÎ󣬻¹ÓÐÆäËû´íÎóô£¿ µÚÈý¾ä£ºAfter fully grinding, small amounts powder were putted into an alumina crucible in a tube furnace and slowly heated to 1400¡æ under a reducing atmosphere (5% H2+95% N2). Â¥Ö÷ÒÉÎÊ£ºÂ¥Ö÷ʵÔÚÕÒ²»³öÕâ¾äÓÐʲôÒÉÎÊ£¿ÄѵÀÊÇputµÄ±»¶¯Óï̬ÓôíÁË£¿ µÚËľ䣺 the characteristic peaks are at 2¦È =12.87¡ã, 25.98¡ã, 31.98¡ã. X-ray diffraction patterns of doped Eu2+ are in good agreement with the X-ray diffraction which is reported by Lee et al, Â¥Ö÷ÒÉÎÊ£º¸Ä³ÉThe characteristic peaks are at 2¦È =12.87¡ã, 25.98¡ã, 31.98¡ã, which agree well with the phase reported by Lee et al, µÚÎå¾ä£ºThe peak position shifts to long wavelength when the Eu2+ concentration is more than a critical concentration, which can be demonstrated as red-shift Â¥Ö÷ÒÉÎÊwhich can be demonstrated as red-shiftÕâ¸ö¾äʽ¶Ôô£¬demonstratedºóÃæÄÜ·ñ¼Óas? µÚÁù¾ä£ºIt can be seen clearly that the enhancement of Ce3+ co-doped SrSiON:Eu2+ is about 140% compared with the one without Ce3+ co-doped. Â¥Ö÷ÒÉÎÊ£º¾ä×ÓÒâ˼ÊǼÓÈëCeÁÁ¶ÈÌá¸ß140%£¬Õâ¾äÕâÑù¸Ä¶Ôô£¬with ºóÃæµÄ co-dopedÊÇ·ñ¼Óing µÚÆß¾ä£ºIt is because of the energy transformation from Ce3+ to Eu2+ in the host lattice of phosphor samples. Â¥Ö÷ÒÉÎÊ£º×ܾõµÄbecause of ÔÚÕâÀïÓò»ºÃ£¬Ó¦¸ÃÓÃattribute to£¿ µÚ°Ë¾ä£ºConsequently, Ce3+ and Eu2+ ions are acted as a sensitizer and an activator, respectively. Â¥Ö÷ÒÉÎÊ£ºConsequently, Ce3+ and Eu2+ ions act as a sensitizer and an activator, respectively.ºÃ»¹ÊÇÉÏÃæÒ»¾äºÃ£¿ µÚ¾Å¾ä£ºTherefore, the electric dipole-dipole interaction predominates in the ET mechanism is from Ce3+ to Eu2+ in SrSiON: Eu2+,Ce3+. Â¥Ö÷ÒÉÎÊ£º is from Ce3+ to Eu2+ in SrSiON: Eu2+,Ce3+ fromÇ°ÃæÒª¼Ó is ô£¿ µÚÊ®¾ä£ºThe 4f¡ú5d transition of Ce3+ and Eu2+ ions is allowed . So the energy transfer from Ce3+ to Eu2+ ions is predominantly due to the electric dipole-dipole interaction according to the theory of energy transfer[13 Â¥Ö÷ÒÉÎÊ£ºÂ¥Ö÷µÄʦÐÖ¾õµÃÕâ¾äÓÐÎÊÌ⣬Õâ¾äÊÇÂ¥Ö÷ÒýÓõÄÀíÂÛ£¬Â¥Ö÷ʵÔÚ¿´²»³öÓï·¨ÓÐʲô´íÎó? µÚʮһ¾ä£ºTherefore, the R of ET was calculate to be about 25.44Å. Â¥Ö÷ÒÉÎÊ£ºÕâ¾ä»°ÊDz»ÊÇʱ̬µÄÎÊÌ⣿ |
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µÚÒ»¾ä£º¸öÈËÒâ¼ûis to physically mix µÚÈý¾ä£ºsmall amounts ºó¼ÓÉÏof µÚÎå¾ä£º¿ÉÒÔ°É¡£Àý¾ä Ó¢ÎÄ This region is demonstrated as a geochemical region with high fluorine through studies on the fluorine contents of soils,magmatic rocks and the Archean?Cenozoic strata geochemical profile. ·Òë ͨ¹ý¸ÃÇøÌ«¹Å½çÒ»ÐÂÉú½ç·úµÄµØ²ãµØÇò»¯Ñ§ÆÊÃæ¼°ÑÒ½¬ÑÒºÍÍÁÈÀÖзúµÄ·á¶ÈµÄÑо¿£¬ÂÛÖ¤Á˸ÃÇøÎªÒ»¸ß·úµÄµØÇò»¯Ñ§Çø¡£ µÚÆß¾ä£ºÎÒÒ²²»ÖªµÀ¡£µ«ÊÇÓÐÀý¾äIt was because of the job that he had taken the flat. ËûÒòΪ¹¤×÷µÄÔÒò×âÁËÄÇÌ×¹«Ô¢ µÚ°Ë¾ä£ºÏÂÃæÄǾä°É£¬²»ÐèÒªÓñ»¶¯°É¡£ µÚʮһ¾ä£ºcalculateÓ¦¸Ã ¸ÄΪcalculated°É |
2Â¥2012-09-19 18:39:51
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3Â¥2012-09-19 18:41:04
chemofish
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wuyuyu2007: ½ð±Ò+2, ¡ï¡ï¡ïºÜÓаïÖú, лл£¬¿ÉÄÜÓÐЩ¾ä×Ӹĺó»¹ÊÇÒªÇëÄã¿´¿´~ 2012-09-20 10:21:24
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wuyuyu2007: ½ð±Ò+2, ¡ï¡ï¡ïºÜÓаïÖú, лл£¬¿ÉÄÜÓÐЩ¾ä×Ӹĺó»¹ÊÇÒªÇëÄã¿´¿´~ 2012-09-20 10:21:24
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½ñÌìûÐÄÇ鹤×÷£¬¾ÍºÍÄãÌÖÂÛÒ»ÏÂÄãµÄÕâЩ¾ä×Ó µÚÒ»¾ä£ºWhile, the most commonly used method is to physically mixed phosphors: yellow/red phosphors, green/red phosphors, or green/yellow/red phosphors [5-7]. So, it¡¯s urgently needed to find novel green or red-emitting phosphor. The most commonly used method is via physical mixing phosphors, such as yellow/red phosphors, green/red phosphors, or green/yellow/red phosphors [5-7]. So, it¡¯s urgent to search for novel green or red-emitting phosphor. µÚ¶þ¾ä£ºHowever, because the emission spectra of these phosphors absences in the red region, so YAG: Ce based white LED has a poor color rendering index (CRI). However, these phosphors lack the red region in their emission spectra of , therefore YAG: Ce based white LED has a poor color rendering index (CRI). µÚÈý¾ä£ºAfter fully grinding, small amounts powder were putted into an alumina crucible in a tube furnace and slowly heated to 1400¡æ under a reducing atmosphere (5% H2+95% N2). Small amounts of fully ground powder were put into an alumina crucible in a tube furnace and slowly heated to 1400¡æ under a reducing atmosphere (5% H2+95% N2). µÚËľ䣺 the characteristic peaks are at 2¦È =12.87¡ã, 25.98¡ã, 31.98¡ã. X-ray diffraction patterns of doped Eu2+ are in good agreement with the X-ray diffraction which is reported by Lee et al, The characteristic peaks are located at 2¦È =12.87¡ã, 25.98¡ã, 31.98¡ã, which agree well with the observation by Lee et al, µÚÎå¾ä£ºThe peak position shifts to long wavelength when the Eu2+ concentration is more than a critical concentration, which can be demonstrated as red-shift The peak position shifts to long wavelength when the Eu2+ concentration is above certain critical concentration, which can be demonstrated as red-shift µÚÁù¾ä£ºIt can be seen clearly that the enhancement of Ce3+ co-doped SrSiON:Eu2+ is about 140% compared with the one without Ce3+ co-doped. Ó¦¸ÃдÃ÷¾ßÌåÊÇʲôÔö¼ÓÁË£¬ÕÛÖбí´ï·¨ºÜ²»ºÏÀí µÚÆß¾ä£ºIt is because of the energy transformation from Ce3+ to Eu2+ in the host lattice of phosphor samples. It is attributed to the energy transformation from Ce3+ to Eu2+ in the host lattice of phosphor samples µÚ°Ë¾ä£ºConsequently, Ce3+ and Eu2+ ions are acted as a sensitizer and an activator, respectively. Consequently, Ce3+ and Eu2+ ions act as a sensitizer and an activator, respectively. µÚ¾Å¾ä£ºTherefore, the electric dipole-dipole interaction predominates in the ET mechanism is from Ce3+ to Eu2+ in SrSiON: Eu2+,Ce3+. Õâ¾ä»°ºÜÄÑ¿´¶®£¬¾ä×ӽṹ²»ºÏÀí µÚÊ®¾ä£ºThe 4f¡ú5d transition of Ce3+ and Eu2+ ions is allowed . So the energy transfer from Ce3+ to Eu2+ ions is predominantly due to the electric dipole-dipole interaction according to the theory of energy transfer[13 The 4f¡ú5d transition of Ce3+ and Eu2+ ions is allowed ÊǺóÃæµÄÀíÓÉÂ𣿺ÃÏñ²»ºÏÀí µÚʮһ¾ä£ºTherefore, the R of ET was calculate to be about 25.44Å. Accordingly, the R of ET was calculated to be about 25.44Å. |
4Â¥2012-09-20 02:01:35
wuyuyu2007
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µÚ¶þ¾ä£ºHowever, because the emission spectra of these phosphors absences in the red region, so YAG: Ce based white LED has a poor color rendering index (CRI). However, these phosphors lack the red region in their emission spectra of , therefore YAG: Ce based white LED has a poor color rendering index (CRI). Â¥Ö÷ÒÉÎÊ£ºÊDz»ÊÇof Ó¦¸ÃÒÆµ½lack ºóÃæ£ºHowever, these phosphors lack of the red region in their emission spectra , therefore YAG: Ce based white LED has a poor color rendering index (CRI). µÚÁù¾ä£º It can be seen clearly that the enhancement of Ce3+ co-doped SrSiON:Eu2+ is about 140% compared with the one without Ce3+ co-doped. Ó¦¸ÃдÃ÷¾ßÌåÊÇʲôÔö¼ÓÁË£¬ÕÛÖбí´ï·¨ºÜ²»ºÏÀí Â¥Ö÷ÒÉÎÊ£º¸Ä³ÉÕâÑù¿ÉÒÔô£ºIt can be seen clearly that the luminescent properties of SrSiON:Eu2+ ,Ce3+ phosphor are enhanced about 140% compared with the one without Ce3+ co-doped. µÚ¾Å¾ä£ºTherefore, the electric dipole-dipole interaction predominates in the ET mechanism is from Ce3+ to Eu2+ in SrSiON: Eu2+,Ce3+. Õâ¾ä»°ºÜÄÑ¿´¶®£¬¾ä×ӽṹ²»ºÏÀí Â¥Ö÷ÒÉÎÊ£º¸Ä³ÉÕâÑù¿ÉÒÔô£¬Hence, the energy transfer from Ce3+ to Eu2+ ions is predominantly attributed to the electric dipole-dipole interaction. |

5Â¥2012-09-20 11:01:37













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