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JST Press Release

July 21, 2015
Japan Science and Technology Agency (JST)
5-3, Yonbancho, Chiyoda-ku, Tokyo 102-8666

Development of solution-processed white phosphorescent tandem organic light-emitting devices

The organic light-emitting devices (OLEDs) comprising multiple light-emitting units (LEUs) stacked in series through charge generation layers (CGLs), called tandem OLEDs, have been fabricated to achieve a high luminance and long operational lifetime simultaneously. We developed the fully solution-processed green and white tandem OLEDs using small molecule phosphorescent materials and their record breaking high efficiency. The ZnO nanoparticle / aliphatic amine polymer (PEIE) bilayer serves as the EIL in each LEU, and poly (3,4-ethylenedioxythiophene) : poly (styrenesulfonate) (PEDOT : PSS) is used as the interconnecting conductive layer. Successfully fabricated green and white phosphorescent stacked OLEDs exhibit nearly a twofold higher efficiency than either of the component LEUs.

Researcher Information

JST S-Innovation (Strategic Promotion of Innovative Research and Development)
R&D Theme “Development of new electronics based on organic materials”
R&D Project “Development of printed and flexible OLED panels for general lighting”

Journal Information

Takayuki Chiba, Yong-Jin Pu, and Junji Kido. “Solution-Processed White Phosphorescent Tandem Organic Light-Emitting Devices”. Advanced Materials, Published online 15 July 2015, doi: 10.1002/adma.201501866.


[About Research]
Takayuki Chiba, Assistant Professor, Ph.D
Yong-Jin Pu, Associate Professor, Ph.D
Junji Kido, Professor, Ph.D
Department of Organic Device Engineering, Research Center for Organic Electronics, Yamagata University


[About Program]
Department of Industry-Academic Collaboration, JST


JST, an integrated organization of science and technology in Japan, establishes an infrastructure for the entire process from the creation of knowledge to the return to the society. For more information, visit http://www.jst.go.jp/EN/