| 초록 |
Color-tuning capabilities of LEDs without using color filters are highly important for the improved cost-efficiency and enhanced deformability, which are key factors for wearable displays. Here, we report a novel material and device design for wearable color-tunable OLEDs by using an ultrathin exciton block layer of DPEPO. The exciton block layer manipulates the balance of charges between two adjacent emission layers, FIrpic and pq2Ir(acac). DPEPO effectively blocks the electron transfer to FIrpic at low voltages, leading to the emission of red light from pq2Ir(acac). A selective charge transfer to FIrpic occurs at high voltages, causing blue-light emission. The wearable OLEDs are integrated with skin-mounted electrophysiology electrodes and wearable amplifiers built from carbon nanotube transistors to display human ECG changes in real-time. These materials and device strategies provide new opportunities for the next generation display and wearable health-monitoring electronics. |
