A series of Bi^(3+)-doped YAG:Ce^(3+), Mn^(2+) ceramics was synthesized successfully by gel-casting method and structurally characterized by XRD and SEM. The doping effect and related mechanism of Bi^(3+) upon the lum...A series of Bi^(3+)-doped YAG:Ce^(3+), Mn^(2+) ceramics was synthesized successfully by gel-casting method and structurally characterized by XRD and SEM. The doping effect and related mechanism of Bi^(3+) upon the luminescent property were studied. It can be assigned to the energy transfer of multipolar interaction from Bi^(3+) to Ce^(3+), leading to the improvement of emission intensity about 58% for 0.0001 Bi^(3+) and 0.05 Mn^(2+) doping. In addition, the emission is significantly red-shifted with the peak at 590 nm for the Y2.9939 Ce0.006 Bi0.0001 Al4.96 Mn0.02 Si0.02 O12 ceramic specimen with in-line transmittance 81.6% at 1100 nm. The LED module assembled from Y2.9939 Ce0.006 Bi0.0001 Al4.96 Mn0.02 Si0.02 O12 ceramic owns correlated color temperature(CCT) of 3960 K and luminous efficiency(LE) of 92 lm/W, implying that doping Bi^(3+) shows a good sensitization effect in the YAG:Ce^(3+), Mn^(2+) ceramic system and further serving as an attracting phosphor candidates for warm WLEDs applications.展开更多
Fe_(2)AlB_(2) powder material was prepared by the direct reaction of iron,aluminum and boron powders in a tubular furnace.The effects of different Al contents,temperature and raw material pretreatment on the purity of...Fe_(2)AlB_(2) powder material was prepared by the direct reaction of iron,aluminum and boron powders in a tubular furnace.The effects of different Al contents,temperature and raw material pretreatment on the purity of product were studied.The mixed powder with the stoichiometric ratio of 1.5Al/2Fe/2B was processed by CIP (Cold Isostatic Pressing),and then calcined at 1150℃ for 120 min.The product containing a small amount of impurities is treated with alkaline solution to obtain high-purity Fe_(2)Al B_(2) powder.Zr B_(2)-Fe_(2)Al B_(2) composite ceramic was successfully prepared at 1250℃ by hot pressing sintering.The density,hardness and fracture toughness were 96.2%,22±0.3 GPa and 5.78±0.5 MPa·m^(1/2),respectively.展开更多
基金Strategic Priority Research Program of the Chinese Academy of Sciences(XDB20010300,XDA21010204)Adv.Energy Sci.&Technol.Guangdong Lab(Open laboratory)。
基金supported by the grants of CAS Priority Research program(XDB20010300,XDA21010204)Natural Science Foundation of Fujian Province(2017H0048)。
文摘A series of Bi^(3+)-doped YAG:Ce^(3+), Mn^(2+) ceramics was synthesized successfully by gel-casting method and structurally characterized by XRD and SEM. The doping effect and related mechanism of Bi^(3+) upon the luminescent property were studied. It can be assigned to the energy transfer of multipolar interaction from Bi^(3+) to Ce^(3+), leading to the improvement of emission intensity about 58% for 0.0001 Bi^(3+) and 0.05 Mn^(2+) doping. In addition, the emission is significantly red-shifted with the peak at 590 nm for the Y2.9939 Ce0.006 Bi0.0001 Al4.96 Mn0.02 Si0.02 O12 ceramic specimen with in-line transmittance 81.6% at 1100 nm. The LED module assembled from Y2.9939 Ce0.006 Bi0.0001 Al4.96 Mn0.02 Si0.02 O12 ceramic owns correlated color temperature(CCT) of 3960 K and luminous efficiency(LE) of 92 lm/W, implying that doping Bi^(3+) shows a good sensitization effect in the YAG:Ce^(3+), Mn^(2+) ceramic system and further serving as an attracting phosphor candidates for warm WLEDs applications.
基金supported by the grants of CAS Priority Research Program(XDB20010300,XDA21010204)Science and Technology Program of Fujian Province(2017T3001)。
文摘Fe_(2)AlB_(2) powder material was prepared by the direct reaction of iron,aluminum and boron powders in a tubular furnace.The effects of different Al contents,temperature and raw material pretreatment on the purity of product were studied.The mixed powder with the stoichiometric ratio of 1.5Al/2Fe/2B was processed by CIP (Cold Isostatic Pressing),and then calcined at 1150℃ for 120 min.The product containing a small amount of impurities is treated with alkaline solution to obtain high-purity Fe_(2)Al B_(2) powder.Zr B_(2)-Fe_(2)Al B_(2) composite ceramic was successfully prepared at 1250℃ by hot pressing sintering.The density,hardness and fracture toughness were 96.2%,22±0.3 GPa and 5.78±0.5 MPa·m^(1/2),respectively.
