Institute of Optoelectronic Technology, Beijing Jiaotong University, Key Laboratory of Luminescence and Optical Information, Beijing Jiaotong University, Ministry of Education，Beijing 100044, China
Abstract：The Alq3 and DCJTB were blended with poly (N-vinylcarbazole) (PVK) in different weight ratios and spin coated into films. Multilayer devices with the light emitting layer PVK∶ Alq3: DCJTB were fabricated, and their structure was ITO/ PVK∶Alq3∶DCJTB/ BCP/Alq3/LiF/Al in which BCP and Alq3 were employed as the hole-blocking and electron-transporting layers respectively, PVK is the blue light-emitting as well as hole-transporting layer. The mass proportion of PVK relative to Alq3 was tuned while the quality ratio of PVK to DCJTB remained (100∶1). Finally, fairly pure and stabile white emission was achieved when PVK∶Alq3∶DCJTB was 100∶5∶1. The CIE coordinate was (0.33, 0.36) at 14 V, which is very stable at various biases (10-14 V).
