Organic optoelectronic device and display device
Inventors
JANG, Kipo • KIM, Byungku • KANG, Giwook • LEE, Hanill • Jung, Sung-Hyun • Jung, Ho Kuk • Jo, Youngkyoung • Yu, Eun Sun
Assignees
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Publication Number
US-12256637-B2
Publication Date
2025-03-18
Expiration Date
Abstract
Disclosed are an organic optoelectronic device includes an anode and a cathode facing each other and an organic layer disposed between the anode and the cathode, wherein the organic layer includes at least one of a hole injection layer, a hole transport layer, a light emitting layer, and an electron transport layer, and the light emitting layer includes a first host, a second host, and a phosphorescent dopant represented by Chemical Formula 4, and a display device including the same.
Core Innovation
The invention relates to an organic optoelectronic device comprising an anode and a cathode facing each other, and an organic layer disposed between the anode and the cathode. The organic layer includes at least one of a hole injection layer, a hole transport layer, a light emitting layer, and an electron transport layer. The light emitting layer includes a first host selected from compounds of [Group-1], and a second host selected from compounds of [Group-2].
The light emitting layer further includes a phosphorescent dopant represented by Chemical Formula 4. In Chemical Formula 4, Z4 to Z11 are independently N, C, or CRc, ring C is bound to ring B through a C-C bond, iridium is bound to ring B through a Ir-C bond, X2 is O or S, and Rc and R14 to R19 are independently hydrogen, deuterium, halogen, germanium group, cyano, or substituted or unsubstituted silyl, alkyl, cycloalkyl, alkylsilyl, aryl, or heterocyclic groups, with n being an integer from 1 to 3.
The disclosed optoelectronic system uses a mixed-host light emitting layer with selected first host and second host combinations together with the phosphorescent organometal dopant. The composition of the first host, the second host, and the phosphorescent organometal dopant is described as achieving improved packing/energy transport, low driving voltage, long lifespan, high efficiency, improved stability, and balanced transport characteristics.
Claims Coverage
The document includes one independent claim directed to an organic optoelectronic device, with three main inventive features: device architecture with anode/cathode and an organic layer, a light emitting layer using a first host and a second host, and a phosphorescent dopant defined by Chemical Formula 4 with specified structural constraints. Dependent claims narrow the phosphorescent dopant to enumerated Chemical Formula 4 sub-forms and extend the device to a display device.
Organic optoelectronic device architecture with layered organic layer
An organic optoelectronic device comprising an anode and a cathode facing each other, and an organic layer disposed between the anode and the cathode, wherein the organic layer includes at least one of a hole injection layer, a hole transport layer, a light emitting layer, and an electron transport layer.
Dual-host light emitting layer
The light emitting layer includes a first host selected from compounds of [Group-1] and a second host selected from compounds of [Group-2].
Ir phosphorescent dopant defined by Chemical Formula 4 structural constraints
A phosphorescent dopant represented by Chemical Formula 4, wherein Z4 to Z11 are independently N, C or CRc, ring C is bound to ring B through a C-C bond, iridium is bound to ring B through a Ir-C bond, X2 is O or S, Rc and R14 to R19 are independently hydrogen, deuterium, halogen, germanium group, cyano, or substituted or unsubstituted silyl, alkyl, cycloalkyl, alkylsilyl, aryl, or heterocyclic groups, and n is an integer ranging from 1 to 3.
Enumerated phosphorescent dopant sub-form selection
The phosphorescent dopant is represented by one of Chemical Formula 4-1 through Chemical Formula 4-6, with structural constraints including X2 being O or S, the substituent variables taking specified options, and n being an integer ranging from 1 to 3.
Display device comprising the organic optoelectronic device
A display device comprising the organic optoelectronic device according to claim 1.
Claim coverage focuses on an organic optoelectronic device in which a light emitting layer uses a first host and a second host and incorporates a phosphorescent dopant defined by Chemical Formula 4. The dopant is structurally constrained by specified ring binding, by X2 being O or S, and by defined substituent options with n ranging from 1 to 3; dependent claims narrow the dopant to enumerated Chemical Formula 4-1 to 4-6 and extend the device to a display device.
Stated Advantages
Improved efficiency.
Longer life-span.
Improved stability and balanced transport characteristics are stated as contributing to device performance.
improved packing/energy transport
low driving voltage
long lifespan
high efficiency
Improved driving voltage and lifetime versus hosts used alone or CBP as second host.
Marked increase in efficiency and lifetime when using the Ir(ppy)3 dopant comparison relative to the DBX-containing dopant context described in the disclosed evaluation.
Documented Applications
A display device comprising the organic optoelectronic device.
An OLED display.
Organic light emitting diode (OLED) device fabrication and evaluation with a reported layer stack including an ITO anode, hole injection/transport layers, a mixed-host light emitting layer, an electron transport layer, and an Liq/Al cathode, with device performance metrics (luminous efficiency (cd/A), T90 lifetime, and driving voltage (Vd)).
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