By Lyuji Ozawa
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Extra info for Cathodoluminescence and Photoluminescence. Theories and Practical Applications
T 3 Improved Luminance from the Phosphor Screen in Display Devices Optimized phosphor powders are screened on to the facepl ate to display light images on the screen. Pho sphor powder consists of 1010 particles per gram, which is comparable to the number of stars in our galaxy. Huge numbers of particles of commercial phosphor powders widely distribute in various sizes and shapes. The CRT (cathode ray tube) industry has used commercial phosphor powders for more than 50 years. ntis chapter focuses on these phosphor screens in term s of (1) improvements in screen luminance, (2) the lifetime of phosphor scree ns, and (3) the ap p lication of phosphor screens to flat cathodoluminescent (CL) de vices.
The excited Eu3 ... on the migration path returns to the ground state. The returned Eu 3... , sampling with replacement) . Sampling with replacement apparently increases C on the migration path. Therefore, C," is less than Cd / for the same particle. For the determination of L EH = cp, we use C/. Assuming that the migration distance of EHs corresponds to LEH = cp at C,", the C," changes with tp. 15 shows average particle size s cp versus the C,' of CD curves of Y202S:Eu (0) and Y202S:Tb (x).
The minimum refreshing cycle is 30 Hz. 17 fJs to phosphor pixel, and the Lspot is constant for practical display devices. The pixel size on the screen is also constant in the given display device. 3) are irradiation duration t and luminance La. We can calculate La for a given L with various t. 1. 1 fJS. If the horizontal line holds for one scanning line (fJs), the holding time is 32 fJS, that is, 320 times the t of the point scan. Therefore, the input power on the pixel reduces to 3 kW·(320)-1 = 9 W /pixel.
Cathodoluminescence and Photoluminescence. Theories and Practical Applications by Lyuji Ozawa