High light-quality OLEDs with a wet-processed single emissive layer.

ABSTRACT: High light-quality and low color temperature are crucial to justify a comfortable healthy illumination. Wet-process enables electronic devices cost-effective fabrication feasibility. We present herein low color temperature, blue-emission hazards free organic light emitting diodes (OLEDs) with very-high light-quality indices, that with a single emissive layer spin-coated with multiple blackbody-radiation complementary dyes, namely deep-red, yellow, green and sky-blue. Specifically, an OLED with a 1,854?K color temperature showed a color rendering index (CRI) of 90 and a spectrum resemblance index (SRI) of 88, whose melatonin suppression sensitivity is only 3% relative to a reference blue light of 480?nm. Its maximum retina permissible exposure limit is 3,454?seconds at 100?lx, 11, 10 and 6 times longer and safer than the counterparts of compact fluorescent lamp (5,920?K), light emitting diode (5,500?K) and OLED (5,000?K). By incorporating a co-host, tris(4-carbazoyl-9-ylphenyl)amine (TCTA), the resulting OLED showed a current efficiency of 24.9?cd/A and an external quantum efficiency of 24.5% at 100?cd/m2. It exhibited ultra-high light quality with a CRI of 93 and an SRI of 92. These prove blue-hazard free, high quality and healthy OLED to be fabrication feasible via the easy-to-apply wet-processed single emissive layer with multiple emitters.

SUBMITTER: Singh M 

PROVIDER: S-EPMC5940822 | biostudies-literature | 2018 May

REPOSITORIES: biostudies-literature