Ritdisplay Corporation

Wei-Su Chen

Jiun-Haw Lee

Chi-Chih Liao

Yung-Chih Lee

An organic light emitting diode (OLED) device comprises a substrate, an anode layer, a luminescence layer, a hole blocking layer and a cathode layer. The anode layer is disposed on the substrate; the luminescence layer is disposed on the anode layer; the hole blocking layer is disposed on the luminescence layer; the cathode layer is disposed on the hole blocking layer. In addition the luminescence layer comprises a hole transporting material and a phosphorescent material, wherein the weight percentage of the bole transporting material and the phosphorescent material is between 40%&tilde;60%.

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Hsinchu Hsien, Taiwan

Wei-Su Chen