Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 15, Pages 7869-7877Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am5081106
Keywords
hot exciton blue fluorophores; hybrid white organic light-emitting diodes; superhigh phosphorescent dopant concentration; improved efficiency roll-off
Funding
- National Natural Science Foundation of China [21102156, 51273209, 514111004, 91233116]
- External Cooperation Program of the Chinese Academy of Sciences [GJHZ1219]
- Ningbo Natural Science Foundation [2014A610126]
- Ningbo International Cooperation Foundation [2012D10009, 2013D10013]
- Ministry of Education [NCET-11-0159]
- Department of Education of Guangdong Province [2012KJCX0008]
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Two blue fluorophores with excellent hybridized local and charge-transfer (HLCT) and hot exciton properties were developed As the blue emitter and the host for orange-red phosphor to achieve highly efficient fluorescent/phosphorescent (PIP) hybrid white organic light-emitting diodes (WOLEDs) in a single-emissive-layer single-dopant (SEML-SD) architecture even at a high concentration of phosphorescent dopant. In the devices, part of the triplet excitons of the blue fluorophores can be utilized to realize reverse intersystem crossing from the triplet excited states to the singlet excited states for,blue emission, and the diffusion volume range of the triplet excitons is reduced significantly. When the phosphorescent dopant concentration is up to 1.0 wt %, which is ten times higher than the traditional single-EML-SD F/P hybrid WOLEDs, highly efficient white emission was still achieved with maximum total external quantum efficiency (EQE) of 23.8%, current efficiency (CE) of 56.1 cd A(-1), and power efficiency (PE) of 62.9 lm W1- The results will supply a novel method for obtaining high efficiency F/P hybrid WOLEDs in a SEML-SD architecture with easily controllable doping concentration.
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