Organic light emitting display device
AssigneeLG Display Co., Ltd.
InventorsJaeseung Jang, Jaeil Song, DongHyuk Kim
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Abstract
An organic light emitting display device is disclosed. The organic light emitting display device includes a first light emitting part between an anode and a cathode, the first light emitting part having a first light emitting layer, and a second light emitting part between the first light emitting part and the cathode, the second light emitting part having a second light emitting layer and a third light emitting layer, wherein the second light emitting layer includes a hole-type host and a first electron-type host, and the third light emitting layer includes a first electron-type host and a second electron-type host.
Claims14
An organic light emitting display device, comprising:
- a first light emitting part between an anode and a cathode, the first light emitting part having a first light emitting layer;
- and
- a second light emitting part over the first light emitting part, the second light emitting part having a second light emitting layer,
- wherein the second light emitting layer includes two regions so that light emission occurs within the second light emitting layer, one of the two regions having a hole-type host and a first electron-type host, and the other one of the two regions having the first electron-type host and a second electron-type host, the first electron-type host and the second electron-type host having different electron mobilities from each other,
- wherein the first electron-type host is disposed in a first portion of the other one of the two regions, and the second electron-type host is disposed in a second portion of the other one of the two regions,
- wherein the first portion is closer to the cathode than the second portion, and the second portion is closer to the anode than the first portion,
- wherein a LUMO (lowest unoccupied molecular orbital) level of the second electron-type host is lower than a LUMO level of the first electron-type host,
- wherein the LUMO level of the first electron-type host is within a range of −2.3 eV to −2.5 eV and the LUMO level of the second electron-type host is within a range of −2.6 eV to −2.8 eV, and
- wherein a difference in the LUMO levels between the first electron-type host and the second electron-type host is equal to or less than 0.5 eV.
An organic light emitting display device, comprising:
- an anode;
- a cathode;
- a first light emitting part between the anode and the cathode, the first light emitting part having a first light emitting layer;
- and
- a second light emitting part between the cathode and the first light emitting part, the second light emitting part having a second light emitting layer and a third light emitting layer between the second light emitting layer and the cathode,
- wherein the second light emitting layer includes a hole-type host and a first electron-type host, and the third light emitting layer includes the first electron-type host and a second electron-type host,
- wherein an electron mobility of the first electron-type host is lower than an electron mobility of the second electron-type host,
- wherein the first electron-type host is disposed in a first portion of the third light emitting layer, and the second electron-type host is disposed in a second portion of the third light emitting layer,
- wherein the first portion is closer to the cathode than the second portion, and the second portion is closer to the anode than the first portion,
- wherein a LUMO (lowest unoccupied molecular orbital) level of the second electron-type host is lower than a LUMO level of the first electron-type host,
- wherein the LUMO level of the first electron-type host is within a range of −2.3 eV to −2.5 eV and the LUMO level of the second electron-type host is within a range of −2.6 eV to −2.8 eV, and
- wherein a difference in the LUMO levels between the first electron-type host and the second electron-type host is equal to or less than 0.5 eV.
Dependencies are inferred from the claim text.