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전자빔 증착 장비를 이용하여 SrS:CuCl TFEL 소자를 제작한 후, 발광특성을 조사하였다. 형광체 모체는 SrS 분말을 사용하였고, 발광중심체로는 CuCl 분말을 0.05 ∼ 0.6 at% 범위에서 첨가하였다. 증착 온도 500 , 전자빔 전류 20 ∼ 40 mA 및 증착율 5 ∼ 10 /sec의 조건에서 형광층 두께를 6000 으로 증착시켰다. CuCl 농도가 낮을 때에는 monomer, dimer, trimer 및 tetramer 발광센터에 의한 청색 발광을 확인할 수 있었으나 휘도가 낮았다. CuCl 농도가 높을 때에는 dimer와 trimer 발광센터에 의한 밝은 녹청색 빛을 방출하였다. 최적의 발광특성은 CuCl 농도를 0.2 at% 첨가한 SrS:CuCl TFEL 소자에서 관찰되었으며, 문턱전압, 휘도(L40), 효율( 20) 및 CIE 색좌표는 각각 55 V, 728 cd/m2, 0.49 lm/W 및 (0.21, 0.33)을 나타내었다.


The SrS:CuCl TFEL devices were fabricated by electron-beam deposition and the luminescent characteristics of the fabricated SrS:CuCl TFEL devices were studied. The SrS powder was used as the host materials and 0.05 ∼ 0.6 at% of CuCl powder was added as the luminescent center. The deposition conditions of substrate temperature, electron beam current, and deposition rate were 500 , 20 ∼ 40 mA, and 5 ∼ 10 /sec, respectively. The total thickness of the phosphor layer deposited was 6000 . The blue emission at low CuCl concentrations was observed from the luminescent centers of monomer, dimer, trimer, and tetramer. The bright greenish blue emission at high CuCl concentrations was observed from the dimer and trimer luminescent centers. The maxium luminance was observed from the SrS:CuCl TFEL devices doped with 0.2 at% of CuCl concentration and the threshold voltage, luminance(L40), efficiency( 20) and CIE coordinate obtained were 55 V, 728 cd/m2, 0.49 lm/W, and (0.21, 0.33), respectively.