2, mass production of large-size screens cannot be realized, so it is only suitable for portable digital products at present;
3. There is a problem of insufficient color purity, and it is not easy to show bright and rich colors.
Modification 2: The service life of organic light-emitting diodes far exceeds 5000 hours, and a large OLED panel with very bright colors is produced.
As of July 2007, the material of Idemitsu Kosan in Japan has the highest performance among fluorescent materials. The red light efficiency reaches 1 1cd/A, and the service life is long.
Up to10.6 million hours; The green light efficiency reaches 30cd/A and the service life is 60000 hours. The blue light material BD-2 (0.13,0.22) with high efficiency and long life is under development, with an efficiency of 8.7cd/A and a life of 23,000 hours.
As for phosphorescent materials, the chromaticity coordinates of red light materials developed by UDC company are (0.67, 0.33), the efficiency reaches 15cd/A, and the working life exceeds 150000 hours at 500cd/m 2. The color coordinate of green material is (0.34, 0.6 1), the efficiency reaches 65cd/A, and the service life exceeds 40,000 hours when the initial brightness is 1 000 CD/m 2. The hardest blue to get
The efficiency of phosphorescent materials reaches 30cd/A, and the lifetime reaches 65438+ million hours when the initial brightness is 200 cd/m 2.
Generally speaking, the luminous efficiency and luminous lifetime of red, green and blue materials of organic light emitting diodes basically meet the actual needs.
From the above data, the current organic light-emitting diodes have a working time of at least 20,000 hours from 500 CD/m 2. You can get 2 points, and if the answer is accepted, you will get reward points and 20 points.