White
top-emitting organic light-emitting diodes (TOLEDs) are attractive
due to their freedom of choice in substrates. However, tunable color
and stable spectra for white TOLED remain considerable challenges.
Here, we conceive a novel, in-planar-electrodes, dual-microcavity
OLED driven by alternating current signals to build white TOLEDs.
Consequently, the microcavity effect in the dual-microcavity OLED
can be separately optimized for blue and yellow emissive units. The
color temperature of the device also can be adjusted by using alternating
current signals. We finally achieve color-tunable, spectra-stable,
flexible, white TOLEDs on polyethylene terephthalate (PET) substrate
and paper substrate. This work will be beneficial to the further development
of white, top-emitting devices, even including quantum dots LEDs and
perovskite LEDs.
As a primary anticounterfeiting technology, most paper anticounterfeiting devices take advantage of photoresponsive behaviors of certain security materials or structures, thus featuring low-security threshold, which has been a critical global issue. To incorporate optoelectronic devices into existing anticounterfeiting technology suggests a feasible avenue to address this challenge. Here we report a high-performance organic light-emitting paper-based flexible anticounterfeiting (FAC) device with multiple stimuli-responsiveness, including light, electricity, and their combination. Without sacrificing the preexisted security information on the paper, we fabricate FAC device in a facile, low-cost yet high-fidelity fashion by integrating patterned electro-responsive and photo-responsive organic emitters onto paper substrates. By introducing optical microcavities, the FAC device shows considerable color shift upon different viewing angle and applied voltage, which is easily discernible by naked eyes. Notably, the FAC device is bendable, unclonable, and durable (a half-lifetime over 4000 hours at 100 cd m−2).
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