摘要
在几种不同的助熔剂的作用下合成了ＢａＡＩ１２Ｏ１９：Ｍｎ发光体，ＸＲＤ谱显示助熔剂不仅有利于基质的结晶成核，而且对基质的不同晶面的生长也有影响．其ＵＶ光谱表明不同的助熔剂对其发光的影响不一样，Ｈ３ＢＯ３不利于其发光，ＡＩＦ３对其发光的提高不大，ＢａＦ２则可以较大地增加其发光强度．其ＶＵＶ光谱显示在１５０ｎｍ附近有较强的激发证实了其可成为用于ＰＤＰ的荧光粉之一．
The phosphor BaAl12O19: Mn was synthesized by solid state reaction at 1300℃under the existence of flux. Its XRD diagram showed the intensity increased with thepresence of the flux, the intensity of different crystal planes W.. changed with the flux,for example, crystal planes (102), (107), (114) and (205 ) became stronger, whilecrystal planes(00 10) and (304) became weak. These results indicate that the flux notonly helped to crystallize the host but also affected on growth of different crystal planes.The UV excitation spectrum consists of three bands peaking at 279urn, 360.5nm,384.6nm, which are due to the 6A1→4A2(4F), 6A1→4E(4D), 6A1→4T2 (4D) of Mn2+tran- sitions, respectively. Its photoluminescence spectra showed there is a stronger emissionband peaking at 514nm and a weak emission band peaking at 450nm. The former band isassighed to Mn2+-emission, and the latter band may be origin from the host. The emission of Mn2+ ions indicated that Mn2+ ions occupy crystallographic site of Al in tetrahedral. The experimental result also indicated that the influence of different flux on the luminescent intensity of the phosphor BaAl12O19: Mn varied: H,BO, decreased its luminescence, AIF3 improved a little and BaF2 improved greatly. The VUV excitation spectrum consists of the bands peaking around 150urn and 195urn that correspond to the hostabsorption and the 3d5→3d4s1 Mn2+ transition. This result reveals that there is an highefficient energy transfer from the host to the activator. The strong absorption at about150nm also indicates that the phosphor BaAl12O19: Mn can act as a better candidate ofPDP phosphors.
出处
《发光学报》
EI
CAS
CSCD
北大核心
1999年第4期311-315,共5页
Chinese Journal of Luminescence
