Key Takeaways & Executive Findings
- •• • Co-doping DPA single crystals with 3% Tc and 0.5% Pen yields white emission with a PLQY of 38.3%, enabling efficient intrinsically polarized white light sources for displays and optical communication. • • The degree of polarization (DOP) reaches 0.96 at 450 nm, 0.71 at 500 nm, and 0.69 at 610 nm, providing high polarization purity essential for 3D displays and quantum computing. • • Large-scale fabrication on a 0.9 cm × 0.9 cm silicon wafer demonstrates scalability, addressing a critical bottleneck in manufacturing miniaturized polarized OLEDs. • • X-ray diffraction confirms that the bc crystal plane is parallel to the substrate, ensuring uniform in-plane crystal orientation and consistent polarized emission across the device area.
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Abstract
Organic light-emitting devices (OLEDs) offer flexibility, lightweight design, and low manufacturing cost, but their emission is typically unpolarized, limiting applications in optical communication, 3D displays, biological imaging, and quantum computing. Conventional polarized light generation relies on external polarizers, which complicates miniaturization and reduces emission intensity. Intrinsically polarized light-emitting materials are sought, yet achieving white-color intrinsically polarized luminescence remains challenging due to a lack of suitable materials and efficient preparation methods. This study reports a groundbreaking fabrication strategy for white organic polarized emissive semiconductor single crystals (WOPESSCs). Using 2,6-diphenylanthracene (DPA) as the host single crystal, tetracene (Tc) and pentacene (Pen) were co-doped into the crystal bulk at mass ratios of 3% and 0.5%, respectively. Density functional theory calculations confirmed that the molecular sizes of Pen and Tc are slightly smaller than DPA, enabling incorporation into the DPA lattice. Spectral overlap between DPA fluorescence and Tc/Pen absorption indicated efficient energy transfer. The fluorescence emission spectra of DPA, Tc, and Pen span blue, green, and red regions, enabling white light generation. Double-doped single crystals with near-white-light emission were grown, and large-scale fabrication was realized on a 0.9 cm × 0.9 cm silicon wafer. The WOPESSCs exhibited uniform luminescence with a photoluminescence quantum yield (PLQY) of 38.3%. X-ray diffraction confirmed that the bc crystal plane was parallel to the substrate. Polarized fluorescence and electroluminescence spectra were measured, revealing a strong dependence of fluorescence intensity on polarization angle. The degree of polarization (DOP) values were 0.96 at 450 nm, 0.71 at 500 nm, and 0.69 at 610 nm. The WOPESSCs were successfully integrated into polarized organic light-emitting diodes (OLEDs), demonstrating their potential for advanced optoelectronic applications.
1. Introduction
Organic light-emitting devices (OLEDs) have gained traction due to their flexibility, lightweight design, and low manufacturing cost. However, their emitted light is typically unpolarized, with electromagnetic fields oscillating randomly in all directions. Polarized light, where the electromagnetic field oscillates in a specific direction, is indispensable for optical communication, three-dimensional displays, biological imaging, and quantum computing. Conventional methods generate polarized light by integrating an unpolarized source with an external polarizer, but this approach is incompatible with miniaturized devices that require complex micro-nano structures, complicating fabrication and reducing emission intensity.
Recent efforts have focused on intrinsically polarized light-emitting materials, yet achieving white-color intrinsically polarized luminescence remains a significant challenge due to the lack of suitable materials and efficient preparation methods. This study introduces a groundbreaking fabrication strategy for white organic polarized emissive semiconductor single crystals (WOPESSCs). By co-doping 2,6-diphenylanthracene (DPA) host crystals with green-emitting tetracene (Tc) and red-emitting pentacene (Pen), the researchers achieved efficient energy transfer and white light generation. The resulting WOPESSCs exhibit a photoluminescence quantum yield of 38.3% and high degree of polarization values (0.96 at 450 nm, 0.71 at 500 nm, 0.69 at 610 nm), and were successfully integrated into polarized organic light-emitting diodes, demonstrating a viable path for advanced optoelectronic applications.
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Yusheng Chen, Paolo Samorì (2025). High-Performance White Emission Polarized Single Crystal and Device. SCIENCE CHINA Materials. https://doi.org/10.1007/s40843-025-3289-5
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Frequently Asked Questions
What is the photoluminescence quantum yield (PLQY) of the WOPESSCs, and how does it compare to conventional white OLEDs?
The WOPESSCs exhibit a PLQY of 38.3%, which is competitive with conventional white OLEDs that typically range from 20% to 40% for solution-processed devices. This value indicates efficient energy transfer from the DPA host to the Tc and Pen guests, enabling bright white emission suitable for practical applications.
What are the degree of polarization (DOP) values at different wavelengths, and what do they imply for device performance?
The DOP values are 0.96 at 450 nm, 0.71 at 500 nm, and 0.69 at 610 nm. The high DOP at 450 nm ensures strong polarization purity in the blue region, critical for 3D displays, while the moderate values in green and red regions still provide sufficient polarization for most applications. These values demonstrate that the WOPESSCs maintain polarized emission across the visible spectrum.
How scalable is the fabrication process for WOPESSCs, and what are the limitations?
The process has been demonstrated on a 0.9 cm × 0.9 cm silicon wafer, showing potential for large-scale fabrication. However, scaling to industrial levels may require optimization of crystal growth conditions to maintain uniformity and avoid defects. The use of co-doping with precise mass ratios (3% Tc, 0.5% Pen) necessitates stringent control, which could pose challenges for high-throughput manufacturing.
What is the stability of the WOPESSCs under continuous operation, and what degradation mechanisms are expected?
The research text does not provide explicit stability data. However, organic single crystals typically exhibit better thermal and photochemical stability than amorphous films. Potential degradation mechanisms include photo-oxidation and thermal quenching, which could be mitigated by encapsulation. Long-term operational stability tests are required to validate their commercial viability.
How does the cost of WOPESSC fabrication compare to conventional polarized OLEDs with external polarizers?
The WOPESSC approach eliminates the need for external polarizers, reducing material and assembly costs. However, the co-doping process and single-crystal growth may incur higher initial costs due to precise control requirements. At scale, the simplified device architecture and potential for roll-to-roll processing could lead to cost parity or even savings compared to conventional polarized OLEDs.
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