Phosphorescence Quantum Yield Formula:
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Definition: This calculator determines the phosphorescence quantum yield based on intersystem crossing quantum yield and other photophysical parameters.
Purpose: It helps researchers quantify the efficiency of phosphorescence emission relative to absorption in molecular systems.
The calculator uses the formula:
Where:
Explanation: The formula accounts for the competition between phosphorescence emission and triplet-triplet annihilation processes.
Details: This parameter is crucial for designing luminescent materials, OLEDs, and understanding photophysical processes in molecules.
Tips: Enter all positive values for the parameters. Typical ranges: Kp (10⁶-10¹² Hz), Ia (10-10⁶ W/m²), φISC (0-1), KTTA (10⁻⁵-10⁻¹ m³/mol·s).
Q1: What is intersystem crossing quantum yield?
A: It's the fraction of excited molecules that undergo transition from singlet to triplet state.
Q2: How is phosphorescence rate constant determined?
A: Typically measured experimentally using time-resolved spectroscopy techniques.
Q3: What affects triplet-triplet annihilation rate?
A: Molecular structure, concentration, temperature, and matrix rigidity influence KTTA.
Q4: Can the quantum yield exceed 1?
A: Normally no, but in systems with triplet-triplet annihilation, apparent yields >1 are possible.
Q5: What are typical values for φphISC?
A: Ranges from 0 (no phosphorescence) to near 1 (highly efficient phosphorescent systems).