以（NH4）2CO3为沉淀剂采用化学共沉淀法在1350℃成功合成了单相Ba1-x Eu xMgAl10O17（0.02≤x≤0.14）蓝色荧光粉。合成温度比传统的高温固相法降低了约250℃。制备的荧光粉颗粒呈准球状形貌，分布均匀且无烧结，晶粒尺寸在0.3μm左右。在254nm紫外光激发下，发射光谱的最大峰值在450nm附近，发射强度比高温固相法提高了大约15%。当x=0.10时发射强度最高。

GdBO3: Eu vaterite type particles with fine size, plate morphology, and non-aggregation were first prepared by the mild hydrothermal method. Their characteristics were investigated and compared with those of particles prepared by solid state reactions. The result showed that the hydrothermal method appears to be applicable to prepare high quality phosphors for practical uses. This conclusion was reinforced by the existence of an important improvement in the photoluminescent performances.

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.

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.