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(Color online) Prompt (solid lines) and delayed (, dotted; , dashed lines) emission spectra of a PhLPPP DFB laser at (blue) and (red). The delayed emission displays both fluorescence (spontaneous emission) around and phosphorescence around . The structure of PhLPPP is also given (, decyl; , hexyl). The inset shows the competing relaxation channels of the optically excited state, namely, spontaneous emission, SE, and ISC, which leads to phosphorescence.
Emission intensity of a PhLPPP polymer film on a corrugated plastic DFB laser substrate (◻, 엯) and on an ITO covered glass substrate (∎, ●) shown in the singlet (panel a) and triplet (panel b) channel. Note that the ITO attenuates SE. The vertical dotted line at an excitation pulse energy of marks the laser threshold observed on the corrugated substrate, which coincides with the leveling off in the triplet channel. The solid lines indicate power laws of exponents of 0.8 and 0.4, respectively.
Phosphorescence intensity of a polymer laser near threshold as a function of excitation pulse energy for three different excitation wavelengths. The curves are normalized to the pulse energy at laser threshold. The saturation behavior of the triplet emission is independent of pump photon energy.
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