New materials and technologies for very-high color rendering and high sunlight spectrum resemblance OLED Lighting Sources

Call: Mutual funds Taiwan – Latvia – Lithuania, 2012
Implementation period: 01.04. 2014. – 01.12.2016.
Project partners:
National Tsing Hua University, Taiwan
Latvian Institute of Organic Synthesis, Latvia
Kaunas University of Technology, Lithuania,
Leader of Latvian team: Professor Edgars Sūna
Total costs: 204 508  EUR
Costs for Latvian partner: 68 169 EUR

In the frame of Latvian-Lithuanian-Taiwan cooperation project, research group from Latvia has developed novel AIEgens for emission layer of OLED devices. AIEgens are luminogens possessing Aggregation Induced Emission (AIE) properties. Design of AIEgens was performed based on tetrazolato Pt(IV) complexes as well as using purely organic (transition metal-free) frameworks.
These first ever AIE active Pt(IV) complexes displayed up to 6 times higher quantum yields in the aggregated state than in solution, similar emission (460-510 nm) and absorption (250-320 nm) patterns in solid and solution states as well as similar lifetimes (1.4-1.8 μs). They have provided novel means of achieving AIE effect.
The novel approach towards AIEgens made possible design of purely organic emitters featuring almost 300 times higher solid state quantum yields as opposed to those in solutions. The organic AIEgens possessed similar emission (broad peaks with maxima around 460-470 nm) and absorption (250-320 nm) patterns in solid state as well as very short lifetimes (<<1μs).