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本文综述了本实验室对粉末DCEL材料的研究结果,文中叙述了直流发光材料和器件方面的研究进展,其中包括材料的制备方法,包铜工艺、ZnS原料,介质的选择原则,形成过程及DCEL机理等。 本文也简要地描述粉末DCEL的应用情况。 ZnS原料颗粒尺寸对DCEL性能的影响是至关重要的,而杂质对DCEL的影响,并不象以前所认为的那么重要。众所周知潮气能使DCEL器件迅速损坏,但我们在实验和理论上都验证了发光效率对DCEL器件寿命的影响比潮气更重要。形成过程中发光区和未形成区域的场强分布随时间连续变化,同时引起发光亮度的变化。亮度衰减可由下式表示: B——夜度 η——发光效率 V_1——电压 V——跨发光区上的电压 R_1,R_2——分别为发光区及未形成区的阻抗。 理论上预言发光区将随形成时间加宽。还发现发光区可出现在发光粉层的任何区域,并讨论了发光区随机性的原因。
This review summarizes the research results of DCEL materials in our laboratory. The research progress of DC materials and devices is described in this paper, including the preparation of materials, the copper-clad process, the selection of ZnS materials, the selection of media, the formation process and DCEL Mechanism and so on. This article also briefly describes the application of powder DCEL. The effect of the particle size of the ZnS raw material on the DCEL performance is of crucial importance, while the effect of impurities on the DCEL is not as important as previously thought. It is well known that moisture can cause rapid damage to DCEL devices, but we have experimentally and theoretically verified that the effect of luminous efficiency on the life of DCEL devices is more important than moisture. The distribution of the field intensity of the light-emitting region and the non-formed region in the formation process changes continuously with time, and at the same time causes the change of the light-emitting luminance. Luminance attenuation can be expressed by the following formula: B - nocturnal η - Luminous efficiency V_1 - Voltage V - The voltage across the luminescent region R_1, R_2 - Respective impedance of the luminescent region and non-formed region. Theoretically, it is predicted that the light-emitting region will widen with the formation time. It has also been found that the light emitting region can appear in any region of the light emitting layer and the reason for the randomness of the light emitting region is discussed.