MCL Technology Showcase

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MCL's proprietary orange emitter material for OLED white lighting

Formula	C₃₁H₂₃IrN₂O₂S₂
Molecular Weight	712.08 g/mole
Thermal Gravimetric Analysis	395℃
Absorption	444nm(in CH₂CI₂)
Photoluminescence	555nm(in CH₂CI₂)

Inset 1. The structure of MCL's orange-yellow emitter material PO-01 and its properties

Since the discovery the phenomenon of organic electroluminescence by Pope et al in 1963, more than two decades the research was mainly on the academic exploration. In 1987, Tang and Vanslyke demonstrated the potential of its practical application realized by a heterojunction architecture of organic light-emitting diode (OLED) with a high quantum efficiency and lower drive voltage. Since then, booming research effort by many groups has pushed the OLED material into the flat panned display era. Recent years, energy saving is becoming a global issue and attracted tremendous attention of research organizations for its commercial potential. Besides LED that has been commercialized and used in many areas, OLED certainly has the advantages and can play a strong role in white lighting application market.

With more than 10 years experience, MCL has developed an orange-yellow phosphorescent emitter material with very high efficiency and high brightness. As disclosed in two patents, TW patent(I242999) and US patent(7445857), the PO-01 is an organic Iridium complex compound material, (Iridium(III)bis(4-phenylthieno[3,2-c]pyridinato-N,C2’) acetylacetonate) with a formula of C₃₁H₂₃IrN₂O₂S₂. This high efficiency yellow phosphorescent was designed as a dopant material for a hole-transport host, e.g. CBP (4,4’-bis(N-carbazolyl)-1,1’-biphenyl).

Device
Driving Voltage (V)	3.60
Current Efficiency (Cd/A)	64.8
Power Efficacy (lm/W)	55.8
CIE (x, y)	(0.50, 0.50)
λ (nm)	560

Inset 2. The summary of the device performance by using MCL’s emitter material PO-01

The PO-01 has been studied in a device with following configuration by using conventional hole transport, electron transport, host and blocking materials: NPB(40nm)/PO-01(8%):CBP(30nm)/BCP(10nm)/Alq3(20nm)/ LiF(0.5nm)/Al(100nm). The device performance was summarized in Inset 2, which is comparable to a world leading commercial yellow dopant of a 62.0 cd/A current efficiency. In addition to superior current efficiency and power efficacy of 64.8 Cd/A and 55.8 lm/W, respectively, PO-01 is also endowed with a high thermal stability of Td = 395℃. The data shown in following figures demonstrate PO-01 as an excellent emitter material characterized with high brightness and current efficiency, high color stability, and external quantum efficiency from 12.6% - 16.7%. Based on this material, because of its lower driving voltage, a device with a low power consumption feature can be easily engineered.

Among other OLED materials under development, a device scheme with LiF/Al/ETL/HBL/Materix:PO-01/EBL/HTL/ITO layout, even better performance data was observed with CE=76.7 cd/A, PE=84.4 lm/W, EQE=19.3%. MCL is keen to collaborate with organizations developing device applications based on our PO-01 emitter material. If you’re interested in our product, please send us your contact information and we will be happy to discuss with you about our offers.

Key Technologies, Facility and Services

OLED, electroluminescence material, EL, yellow-orange emitter material, dopant, high brightness, high efficiency, high power efficiency

Contact information

MCL Technology Showcase
Chun-Sien Lin, PhD, Senior Researcher
Materials and Chemical Research Labs, ITRI
Tel: 886-3-5913597 Fax:886-3-5835087
Email: mcl_tech@itri.org.tw
Address : Rm. 205-2, Bldg. 77, 195, Sec. 4, Chung Hsing Rd.,
Chutung, Hsinchu, Taiwan 31015


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