Chapter 1 General Introduction
1.3 Outline
This thesis mainly focuses on the improvement of the TADF OLED and organic semiconductor laser performances based on newly designed molecules, aiming to obtain highly efficient TADF characteristics, excellent horizontal molecular orientation of light-emitting dipoles and low ASE/lasing thresholds.
In Chapter 2, I will demonstrate that horizontal orientation of the emission transition dipole of light-emitting molecules plays a critical role on the light outcoupling efficiency and the performance of organic light-emitting diodes. It is well established that linear and planar small molecules are generally preferred to achieve such a horizontal molecular orientation in vapor-deposited organic thin films. I designed and synthesized four novel carbazole-based TADF molecules with different shapes and degrees of planarity in order to examine the influence of the emitter structure on the molecular orientation and the electroluminescence properties in TADF OLEDs.
In Chapter 3, I focused on the development of novel NIR light-emitting boron difluoride curcuminoid derivatives for high performance OLEDs. I will demonstrate that these heavy-metal-free donor-acceptor-donor (D-A-D) derivatives show high PLQY and TADF activity at room temperature. In addition, their emission spectrum can be tuned either via molecular engineering of the D and A groups or via solvatochromism effect, due to the CT character of the excited states and the large dipole moments of these compounds both in their ground- and excited-states. These NIR emitters were then tested in spin-coated NIR OLEDs.
In Chapter 4, I demonstrate that these boron difluoride derivatives exhibit ASE with relatively low threshold in the NIR region of the electromagnetic spectrum. The ASE wavelength of the films can be tuned again by the molecular engineering of the dyes and by playing on the concentration of dyes in the film. Due to the TADF properties of these NIR dyes,
these results suggest a new possible route to realize organic semiconductor lasers in which triplet excitons could contribute positively to light amplification.
In Chapter 5, I report on the photophysical, ASE and electroluminescence properties of a blue-emitting octafluorene derivative in spin-coated films. The neat film shows an extremely low ASE threshold, which is related to its high photoluminescence quantum yield and its large radiative decay rate. Low-threshold organic distributed feedback semiconductor lasers and fluorescent OLEDs with a maximum external quantum efficiency as high as 4.4% are then demonstrated, providing evidence that this octafluorene derivative is a promising candidate for organic laser applications.
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