Abstract
A holographic display system requires the external diffraction efficiency to be greater than 10% and four orders of magnitude of sensitivity for practical usage. To achieve such requirements, the photorefractive (PR) performance of PR composite based on poly[bis(2,4,6-trimethylpheneyl)amine] (PTAA) has been investigated. In the present report, the change of the content of PTAA as a photoconductive polymer, (2,4,6-trimethylphenyl)diphenylamine (TAA) as a photoconductive plasticizer, and second trap agent bathophenanthroline (BPhen) reasonably optimized the PR response time and external diffraction efficiency. High sensitivity of 1851 cm2 J−1 with response time of 494 μs and external diffraction efficiency of 23.9% were achieved at 532 nm and 60 V μm−1 by reducing the content of PTAA and increasing the contents of TAA and BPhen. Decreasing the amount of PTAA and increasing the contents of TAA and BPhen lowered the absorption coefficient, resulting in the high external diffraction efficiency. The narrower distribution of the electronic density of states (DOS) for PTAA/TAA (43.5/20 and 33.5/30) also contributed to the shorter PR response time of hundreds of microseconds.
Highlights
Photorefractive (PR) polymer composites are prospective candidates for use in holographic three-dimensional (3D) displays that provide realistic images without special eyeglasses[1,2,3,4]
As shown in equation (3), the external diffraction efficiency is significantly influenced by the absorption coefficient at the reading wavelength of the probe beam
The content of PTAA significantly influences the absorption coefficient of the PR composites based on PTAA
Summary
Photorefractive (PR) polymer composites are prospective candidates for use in holographic three-dimensional (3D) displays that provide realistic images without special eyeglasses[1,2,3,4]. To achieve the external diffraction efficiency greater than 10%, further optimization of each composition for the PR composites based on PTAA is required to decrease the absorption coefficient. We optimized the ratio of the PTAA, TAA and BPhen to obtain the enhanced PR performance and achieved the higher external diffraction efficiency of 23.9% and higher sensitivity of 1851 cm[2] J−1 at 532 nm and 60 V μm−1 for the PR composite of PTAA/PDCST/TAA/PCBM/BPhen with weight ratio of 31.5/35/30/0.5/3. The low absorption coefficient by the optimization of the composite is the key point for higher external diffraction efficiency and higher sensitivity. The empirical sensitivity, containing the elements of the response time and the external diffraction efficiency, was estimated to indicate the most promising candidate of the PR composite based on PTAA as real-time 3D holographic displays
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