Samsung Display Co., Ltd. (Yongin-si, KR)

An organic light-emitting device and flat-panel display device, the organic light emitting device comprises an anode, an cathode; and an organic layer including an emission layer, a hole transport region between the anode and the emission layer, and a hole transport region comprises at the very least one of a hole injection layer, a layer for transporting holes, an electron blocking layer and an electron-blocking layer, and an electron transport region between the emission layer and cathode, the electron transport area comprising at least one of the hole blocking layer an electron transport layer as well as an electron injection layer, and buffer layers that are between the emission layer and the electron transport region, wherein the buffer layer is comprised of a biscarbazole-based derivative and triphenylene-based derivative, as well as an energy triplet (E.sup.T1) of the biscarbazole-based derivative or the triphenylene-based derivative , and an energy triplet (E.sup.T2) of an emission dopant. layer satisfy the following relationship: E.sup.T1>E.sup.T2.

1. Field

Embodiments are a part of the organic light-emitting device.

2. Description of Related Art

Organic light emitting devices (OLEDs) These are self-emitting, can provide advantages such as wide viewing angles, excellent contrast, quick response, high brightness, excellent performance in terms of driving voltage, and offer multicolored images.

A structure that emits organic light can comprise a first, second and third region of hole transport along with an emission layer, electron transport region, and an emission layer. The hole transport area may allow electrons to move from the second electrode towards the emission layers. Holes that are injected through the first electrode may be transported to the layer through the hole transport zone, and electrons could move from the second electrode to that layer via electron transport. Excitons can be produced by carriers (e.g. electrons and holes). Light is produced when excitons drop from an excited state to a ground state.

These embodiments target an organic light-emitting device.

Additional aspects will also be described in the next description. These additional features can be derived from the description, or by applying the present embodiments.

In accordance with some or all of the embodiments described in this disclosure an organic light-emitting apparatus comprises an anode, cathode; and an organic layer disposed between the anode and cathode

wherein the organic layer includes the following: i) an area of hole transport disposed between the anode and the emission layer, and comprising buffer layers as well as at least one of an injection layer for holes and a layer for transporting holes and an electron blocking layer andii) an electron transport area located between the cathode and the emission layer and comprising at least one of a hole blocking layer and an electron transport layer, as well as an electron injection layer

The buffer layer is situated between the electron transport area and the emission layer.

The buffer layer has a biscarbazole derivative and an a triphenylene derivative.

A triplet energy, E.sup.TI, of one of the biscarbazole or triphenylene-based derivatives and a triplet energie (E.sup.T2) from a dopant in the emission layer are in line with this relation: E.sup.T1>E.sup.T2.

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