Single phases of LnAlO3: Eu3+(Ln=Gd, Y) were obtained by the process of evaporation of their nitric acid so-lution, and then pyrolysis of their nitrate salts. On monitoring by 613nm emission, broad bands at around 270 and 170nm were observed in the excitation spectrum of Gd0.95Eu0.05AlO3. These peaks could be as igned to charge transfer (CT) transitions of Eu3+-O2- and Gd3+-O- respectively. All the transitions observed in Gd0.95Eu0.05AlO3 are faithfully repro-duced in the Y0. 95Eu0. 05AlO3, but with an exception of the 8S7/2→6I11/2 transition of Gd3+The 153nm broad band could be the CT transition of Y3+-O-. Accordingly, the efficiency luminescence of (Gd, Y)BO3: Eu3+ was explained as a result of CT transitions of Gd3+-O- and Y3+-O- under 147nm excitation. Under VUV excitation, Gd0.95Eu0.05AlO3 exhibits a bright red luminescence with CIE chromaticity coordinates of (0.623, 0.335) with a PL intensity of 30 of the commercial phosphor (Gd, Y) BO3: Eu3+ (KX2504A). The PL spectrum of Y0.95Eu0.05AlO3 is similar to that of Gd0.95Eu0.05AlO3. Cal-culation of the color coordinates gives x=0.636, y=0.340 with a PL intensity of 50 of the (Gd, Y) BO3: Eu3+(KX2 504A) for Y0.95Eu0. 05AlO3, and confirms that it has the appearance of pure spectral red, corresponding approximately to 608nm. It can be concluded that LnAlO3: Eu3+is a promising red VUV phosphor.

The luminescent properties of Ca4GdO(BO3)3: Eu3+ were investigated under excitation of UV and VUV light. Separate two broad bands at around 259 and 184nm were observed in the excitation spectrum of Ca4GdO(BO3)3: Eu3+. These peaks were assigned to the charge transfer transition of Eu3+-O22 and Gd3+-O22, respectively. Owing to the favorable spectral position in their broad intense excitation band, Eu3+ ions show a intense emission under 258nm excitation in Ca4GdO(BO3)3: Eu3+. This spectral position was determined by the free oxygen ions O (1). Ca4GdO(BO3)3 doped with Eu3+ ion seems to be a preferable candidate as red lamp phosphor. On the other hand, a weak band with a maximum at about 184 nm was observed below 200 nm in the excitation spectrum of Ca4GdO(BO3)3: Eu3+. This phosphor do not emit effectively under the 147 nm excitation. This unfavorable profile was also due to the O (1) ions, which played a role to the shifting towards the lower energy sides. The luminescence of Eu3+ ions in Ca4GdO(BO3)3 was somewhat different from that observed in the other borates phosphors, but resembled to those observed in the oxide phosphors (e.g. Gd2O3, Y2O3 and Gd2SiO5). Such behavior was recognized by the detailed analysis of crystallographical surroundings around activator.

用水热法在低于300℃成功地制备出具有不同形貌的YBO3：Eu3+荧光粉，其反应温度比固相反应降低了约800℃。研究了初始原料、pH值、反应温度、反应溶剂和催化剂等条件对目的产物形貌及粒度的影响。得到了具有Vaterite结构、粒度分布均匀的球形荧光粉的最佳合成工艺。在254 rim激发下，水热法制备的球形Y Euo-o BO3荧光粉最强发射峰位于598rim处，属于Eu抖的 D。一的跃迁，是固相反应所得样品的1.5倍。这些结果表明，在PDP和荧光灯等显示和照明用荧光粉的制备中水热法具有潜在的应用前景。

A broad excitation band in an excitation spectrum of (Gd,Y) BO3:Eu was observed in the VUV region. It could be considered that this band was composed of two bands at about 160 and 166nm. The preceding band was assigned to the BO3 group absorption. The later one at about 166nm could be assigned to the charge transfer (CT) transition of Gd3+-O2. Such an assignment was deduced from the result that broadbands at around 170nm for GdAlO3:Eu, and at 183nm for Gd2SiO5:Eu are due to the CTtransition of Gd3+-O2; this was also identified by CaZr (BO3)2:Eu. Since there are no Gd3+ ions in it; a weak band in the VUV region in the excitation spectrum of Ca0.95ZrEu0.05(BO3)2 was observed. The excitation spectra were overlapped between the CT transition of Gd3+-O2 and BO3 group absorption, and it caused the emission of Eu3+ effectively in the trivalent europium-doped (Gd, Y)BO3 host lattice under 147nm excitation. Intense broad excitation bands were observed at about 155nm for YBO3:Eu and at about 153nm for YAlO3:Eu; it could be attributed to the CTtransition between Y3+ and O2. As a result, under the xenon discharge (147nm) excitation, the intense emission of Eu3+ in GdBO3 was found to be more convenient just because of the partial substitution of Y3+ for Gd3+.

anganese-doped zinc silicate powder samples were prepared successfully by solution combustion process, and their photoluminescence were investigated in ultraviolet region. The single-phase of Zn2-xSiO4: xMn (0≤x≤0.10, willemite) was obtained by combustion synthesis at 600℃for afew minutes, then heat treated at above 900℃ for 4h. In the excitation spectra of Zn2-xSiO4: xMn (0<x≤0.10), the strongest broad band at about 254nm is observed and as-signed to 6A1→4T1 transition of Mn2+ monitoring at 525nm emission. At about 525nm, the intense broad band emission is observed under 254nm excitation in Zn2-xSiO4: xMn (0<x≤0.10). This broad band is attributed to 4T1→6A1 transi-tion of Mn2+. The results indicate that photoluminescence efficiency, the location of the strongest excitation or emission band, and the optimum concentration of activator depend on starting materials, combustion temperatures, the dosage of fu-els, and the size of powder samples etc.