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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.

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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.
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2Â¥2012-09-19 18:39:51
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3Â¥2012-09-19 18:41:04
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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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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
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wuyuyu2007

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4Â¥: Originally posted by chemofish at 2012-09-20 02:01:35
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 . ...

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.
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5Â¥2012-09-20 11:01:37
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