Construction of Efficient Deep Blue Aggregation-Induced
Emission Luminogen from Triphenylethene for Nondoped Organic Light-Emitting
Diodes
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Abstract
Deep blue emitters are crucial for
full color displays and organic
white lighting. Thanks to the research efforts by scientists, many
efficient light emitters with aggregation-induced emission (AIE) characteristics
have been synthesized and found promising applications in organic
light-emitting diodes (OLEDs). However, few AIE emitters with deep
blue emissions and excellent electroluminescence (EL) performance
have been reported. The contribution here reports a simple but successful
molecular design strategy for synthesizing efficient solid-state emitters
for nondoped OLEDs with both deep blue and white emissions. This strategy
utilizes triphenylethene, a weakly conjugated AIE luminogen,
as building block for constructing deep blue emitter, involving no
complicated control of emission color through adjustment of the steric
hindrance of chromophores, and enables a wide selection of partnered
functional units. The synthesized AIE luminogen, abbreviated as BTPE-PI,
is thermally stable and exhibits high fluorescence quantum efficiency
as well as good charge injection capability in the solid state. Nondoped
deep blue OLED fabricated from BTPE-PI shows a very high external
quantum efficiency of 4.4% with a small roll-off, whose performance
is the best among deep blue AIE materials reported so far. An efficient
white OLED with Commission Internationale de l’Eclairage (CIE)
coordinates of (0.33, 0.33) at theoretical white point was first achieved
by using AIE luminogen BTPE-PI as deep blue emitter. Such molecular
design strategy opens a new avenue in the development of efficient
solid-state deep blue emitters for nondoped OLED applications