We have synthesized bluish-green, highly-efficient BaSi2O2N2:Eu2+ and (Ba,Sr)Si2O2N2:Eu2+ phosphors through aconventional solid state reaction method using metal carbonate, Si3N4, and Eu2O3 as raw materials. The X-ray diffraction (XRD)pattern of these phosphors revealed that a BaSi2O2N2 single phase was obtained. The excitation and emission spectra showedtypical broadband excitation and emission resulting from the 5d to 4f transition of Eu2+. These phosphors absorb blue light ataround 450nm and emit bluish-green luminescence, with a peak wavelength at around 495 nm. From the results of anexperiment involving Eu concentration quenching, the relative PL intensity was reduced dramatically for Eu=0.033. A smallsubstitution of Sr in place of Ba increased the relative emission intensity of the phosphor. We prepared several white LEDsthrough a combination of BaSi2O2N2:Eu2+, YAG:Ce3+, and silicone resin with a blue InGaN-based LED. In the case of onlythe YAG:Ce3+-converted LED, the color rendering index was 73.4 and the efficiency was 127lm/W. In contrast, in theYAG:Ce3+ and BaSi2O2N2:Eu2+-converted LED, two distinct emission bands from InGaN (450nm) and the two phosphors (475-750nm) are observed, and combine to give a spectrum that appears white to the naked eye. The range of the color renderingindex and the efficiency were 79.7-81.2 and 117-128 lm/W, respectively. The increased values of the color rendering indexindicate that the two phosphor-converted LEDs have improved bluish-green emission compared to the YAG:Ce-converted LED.As such, the BaSi2O2N2:Eu2+ phosphor is applicable to white high-rendered LEDs for solid state lighting.

본 연구의 목적은 기존의 고상 반응법을 이용하여 일본의 상용 Zn2SiO4:Mn형광체보다 우수한 성능의 형광체를 제조하는데 있다. 이틀 위해 본 연구에서는 고상 반응법을 이용하여 Zn2SiO4:Mn 형광체를 합성하고, 이를 PDP(Plasma Display Panel)에 적용하기 위하여 소성온도 및 환원 온도와 주입되는 기체의 양, dopant Mn의 농도를 다양하게 하여 합성하였고, ball milling 등을 통하여 입자의 특성을 개선하는 실험을 하였다. 제조된 형광체의 발광특성 및 모양 등의 특성은 상용 Zn2SiO4:Mn 형광체와 비교하였다. Mn의 농도를 0.08mo1e로 하여 1300˚C에서 소성하였을 때 결정성 및 휘도가 가장 우수하였고, 환원시 5% H2-96% N, 혼합가스의 양을 100ml/rnin으로 일정하게 주입시켰을 때 20%이상 휘도가 증가하였다. Ball rnilling은 30분 동안 100rpm으로 하였을 때 입자의 크기가 수십 μm에서 3μm이하로 줄어들었다. 특히. 발광 특성이 상용 형광체보다 월등히 우수하여 PDP에 적용할 수 있다