Organic electroluminescent materials and devices
AssigneeUniversal Display Corporation
InventorsTyler Fleetham, Eric A. Margulies, Bin Ma, Pierre-Luc T. Boudreault, Bert Alleyne, Ting-Chih Wang
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Abstract
The present disclosure provides for an organic electroluminescent device (OLED) including an anode; a cathode; and an emissive layer, disposed between the anode and the cathode. The emissive layer includes a phosphorescent dopant, a first host, and a second host, wherein the first host transports holes, the second host transports electrons, and the first host is fully or partially deuterated. Consumer products that include the OLED are also provided.
Claims19
An organic electroluminescent device (OLED) comprising:
- an anode;
- a cathode;
- and
- an emissive layer, disposed between the anode and the cathode,
- wherein the emissive layer comprises a phosphorescent dopant, a first host, and a second host, wherein the first host transports holes, the second host transports electrons,
- wherein the first host is fully or partially deuterated;
- and
- at least one of the following conditions is true:
- (i) the second host does not comprise a carbazole or an indolocarbazole;
- (ii) the second host has a HOMO level <−5.75 eV;
- (iii) the second host has a HOMO level >−5.5 eV and is at least 25% deuterated;
- (iv) the second host comprises biscarbazole or indolocarbazole moiety that is at least 60% deuterated;
- (v) the first host comprises a hole transporting moiety that is at least 50% deuterated and the second host comprises an electron transporting moiety that is at least 50% deuterated;
- and
- (vi) the OLED has a lifetime represented by LT95, that is at least 75% higher than the lifetime LT95 of a comparative OLED, wherein the comparative OLED is constructed so that the only difference between the OLED and the comparative OLED is that the comparative OLED has a first host that is not deuterated, and wherein LT95 of a device is measured as a time to reduction of luminance of said device to 95% of its initial luminance at a constant current density of 80 mA/cm2.
A consumer product comprising an OLED comprising:
- an anode;
- a cathode;
- and
- an emissive layer, disposed between the anode and the cathode,
- wherein the emissive layer comprises a phosphorescent dopant, a first host, and a second host, wherein the first host transports holes, the second host transports electrons,
- wherein the first host is fully or partially deuterated;
- and
- at least one of the following conditions is true:
- (i) the second host does not comprise a carbazole or an indolocarbazole;
- (ii) the second host has a HOMO level <−5.75 eV;
- (iii) the second host has a HOMO level >−5.5 eV and is at least 25% deuterated;
- (iv) the second host comprises biscarbazole or indolocarbazole moiety that is at least 60% deuterated;
- (v) the first host comprises a hole transporting moiety that is at least 50% deuterated and the second host comprises an electron transporting moiety that is at least 50% deuterated;
- and
- (vi) the OLED has a lifetime represented by LT95, that is at least 75% higher than the lifetime LT95 of a comparative OLED, wherein the comparative OLED is constructed so that the only difference between the OLED and the comparative OLED is that the comparative OLED has a first host that is not deuterated, and wherein LT95 of a device is measured as a time to reduction of luminance of said device to 95% of its initial luminance at a constant current density of 80 mA/cm2.
Dependencies are inferred from the claim text.