| Summary: | 碩士 === 國立交通大學 === 照明與能源光電研究所 === 103 === In this thesis, we proposed the novel colloidal quantum dot (CQD) thin film and light-emitting devices. The CdTe colloidal quantum dots are embedded in the sodium chloride (NaCl) ionic crystal to prevent from external wear. The photoluminescence (PL) with this kind of powder, mixed with organic film (PDMS) on glass substrate, was measured. Under different overlapping manner, a better PL intensity can be found at multiple layers condition.
The mixture of colloidal quantum dots/NaCl composite and polymer can be filled inside the standard LED package and optically pumped by the UV LED. Due to extra scattering brought by the sodium chloride grains, the resultant photoluminescent quantum yield (PLQY) can be as high as 72.6% at the medium current level. For the long-term stability assessment, two different UV pumping were set up. With this encapsulation, the stability of the colloidal quantum dot light output over time can be improved, and a prolonged 6488-hour of lifetime can be demonstrated under the continuous UV aging condition.
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