Development of Ceramic Type Thin-Film Electroluminescent Devices High-Luminance Flat Panel Lamp

具有高亮度和高发光效率的大面积薄膜电致发光（TFEL）器件不仅可以用作平板显示器，还可以用作平板灯。采用刮刀法制备了大面积BaTiO_3陶瓷片。在不经研磨或抛光的情况下，获得了厚度为0.14-0.4mm的表面光滑的BaTiO_3陶瓷片。采用低压化学气相沉积（MOCVD）技术在陶瓷片上沉积了ZnS：Mn薄膜发射层。为了获得ZnS：为了获得高亮度、高发光效率的MnTFEL器件，优化了BaTiO_3陶瓷片作为绝缘层的介电性能和ZnS：Mn薄膜作为发光层的退火条件，研制出了高发光效率的ZnS：MnTFEL器件。采用厚度为0.4mm的陶瓷片制作的ZnS：Mn薄膜电致发光器件，在5、1 kHz和60 Hz驱动下，橙子发光的亮度分别达到16000、5800和750 cd/m2，最大发光效率分别为12.5、11和61 m/W。在5 kHz正弦波电压为200 V的驱动下，ZnS：Mn薄膜电致发光器件的发光效率为11.5lm/W，亮度为9500 cd/m^2。使用绝缘陶瓷片的薄膜电致发光器件的发光效率高于传统的双绝缘层薄膜电致发光器件。用Ga_2O_3：Mn或Ga_2O_3：Cr薄膜作发光材料的薄膜电致发光器件获得了高亮度的绿色或红色发光

Large area thin-film electroluminescent (TFEL) devices with high luminance as well as high luminous efficiency have been developed not only as Flat panel displays but also as flat panel lamps. The large area BaTiO_3 ceramic sheet was formed using a doctor blade method. Smooth surface BaTiO_3 ceramic sheets with a thickness of 0.14-0.4mm were obtained without the use of grinding or polishing processes. The ZnS : Mn thin-film emitting layr was deposited onto the ceramic sheets by a low-pressure chemical vapor deposition (MOCVD) technique. To obtain ZnS : Mn TFEL devices which exhibit a high luminance as well as high-luminous efficiency, both the dielectric properties of BaTiO_3 ceramic sheet as the insulating layr and postannealing conditions of ZnS : Mn thin film as the emitting layr were optimized.High-liminous efficiency ZnS : Mn TFEL devices using a BaTiO_3 insulating ceramic sheet prepared by the doctor blade method without the use of grinding or polishing processes were developed. Luminances above 16000,5800 and 750cd/m^2 and maximum luminous efficiencies of 12.5,11 and 61m/W for orange emission were obtained in a ZnS : Mn TFEL device using a ceramic sheet with a thickness of about 0.4mm, when driven at 5,1kHz and 60Hz, respectively. In addition, a luminous efficiency of 11.5lm/W and a luminance of 9500 cd/m^2 were obtained in a ZnS : Mn TFEL device driven by a 5kHz sinusoidal wave voltage of 200 V.The luminous efficiencies obtained in TFEL devices using an insulating ceramic sheet were higher than those reported in conventional double-insulating-layr-type TFEL devices. High luminances for green or red emisssion were obtained in TFEL devices with a Ga_2O_3 : Mn or a Ga_2Oa_3 : Cr thin-film emitting