摘要
采用低电阻率的Ta2O5／SiO2、Ta2O5／Al2O3复合层制备出低压驱动ZnS：Mn薄膜电致发光器件，它的阈值电压在40V以下。当驱动电压为60V、频率为50Hz时，发光亮度在200cd／m2以上。这种器件具有其独特的亮度-电压特性和电荷存储量-电压特性。利用空间电荷限制电流模型分析了发光层中空间电荷、电场强度在这种低压驱动电致发光器件发光层中的分布特性，并对低压驱动薄膜电致发光机理、亮度-电压特性、电荷存储量-电压特性进行了解释。分析表明复合层的电导性质是获得低压驱动电致发光器件的关键。
Low-voltage-driven thin film electroluminescent devices are developed by using lowxesistivity stacked film SiO2/Ta2O5 and Al2O3/Ta2O5. At 50 Hz sinusoidal wave voltage excitation, its threshold voltage is below 40 V, and brightness is above 200cd/ cm2 at 60 V. Its characteristics of brightness^voltage (B ~ V) curve and integrated charge^voltage (Q ~ V) figure are different from usual one. By using a model of space charge- limited- Cur rent, the distr ibution char acter istics of the space charge and electr ical field acrosss the phosphor in the device are analyzed, the mechanism of low-voltage driven thin film electroluminescence, and the charactCristics of B ~ V curve and Q ~ V , figure are well explained. It is considered that the electroconductibility of the stacked film is the key of low-voltuge-driven thin film electroluminescence.
出处
《光学学报》
EI
CAS
CSCD
北大核心
1996年第4期551-555,共5页
Acta Optica Sinica
关键词
电致发光
低压驱动
空间电荷限制
显示器
electroluminescence, low-voltage-driven,space-charge-limited-current
