公开(公告)号：US3809941A

公开(公告)日：1974-05-07

申请号：US27077472

申请日：1972-07-11

Applicant: WESTINGHOUSE ELECTRIC CORP

Inventor： BOURG H ,  CROMWELL R ,  BURNIE G ,  NICHOLSON J

IPC: H01J1/34

CPC classification number: H01J1/34 ,  H01J2201/3423 ,  H01J2201/3425

Abstract: A photoemitter of improved quantum efficiency is formed by smoke or low density deposition of photoemissive materials on a substrate. Significantly, the photoemissive layer is deposited in the presence of a low pressure gas to form a layer whose density is not greater than 20% and preferably not greater than 5% of the photoemissive material in its bulk form. Individual particle size is controlled and deposited particles are isolated, affording greater surface contact area with the subsequently deposited constituent materials of the photoemissive surface, thereby enhancing interaction and increasing the photoelectron emission. The low density, randomly oriented smoke deposits provide a photosensitive surface characterized by high absorption, low reflective losses, and low transmissive losses. The spectral response curve of smoke photoemitters peaks further into the red or near infrared region than prior art devices, rendering the smoke photoemitters of the invention ideally suited for use as near infrared sensors in low light level imaging system.

Abstract translation: 通过烟雾或光致发光材料在衬底上的低密度沉积形成提高量子效率的光电发生器。 重要的是，在低压气体的存在下沉积光发射层以形成密度不大于散装形式的光发射材料的20％，优选不大于5％的层。 单独的粒度被控制，并且沉积的颗粒被分离，与随后沉积的光发射表面的构成材料提供更大的表面接触面积，从而增强相互作用并增加光电子发射。 低密度，随机取向的烟雾沉积物提供了以高吸收，低反射损失和低透射损耗为特征的感光表面。 烟雾光谱仪的光谱响应曲线比现有技术的装置进一步高于红色或近红外区域，使得本发明的烟雾发光体理想地适合用作低光级成像系统中的近红外传感器。