Fluoroscence Quantum Yield given Phosphorescence Quantum Yield Calculator

Formula Used:

\[ \phi_{FL} = \phi_{ph} \times \left( \frac{K_f \times [M_{S1}]}{K_p \times [M_{T}]} \right) \]

Phosphorescence Quantum Yield (φ_ph):

Rate Constant of Fluoroscence (K_f):

Singlet State Concentration [M_S1]:

mol/m³

Phosphorescence Rate Constant (K_p):

Concentration of Triplet State [M_T]:

mol/m³

Fluorescence Quantum Yield (φ_FL):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is Fluoroscence Quantum Yield?

Definition: Fluoroscence Quantum Yield is a measure of the efficiency of photon emission as defined by the ratio of the number of photons emitted to the number of photons absorbed.

Purpose: It helps researchers quantify the efficiency of fluorescence emission relative to phosphorescence in molecular systems.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ \phi_{FL} = \phi_{ph} \times \left( \frac{K_f \times [M_{S1}]}{K_p \times [M_{T}]} \right) \]

Where:

\( \phi_{FL} \) — Fluorescence quantum yield
\( \phi_{ph} \) — Phosphorescence quantum yield
\( K_f \) — Rate constant of fluorescence (Hz)
\( [M_{S1}] \) — Singlet state concentration (mol/m³)
\( K_p \) — Phosphorescence rate constant (Hz)
\( [M_{T}] \) — Triplet state concentration (mol/m³)

Explanation: The formula relates the fluorescence quantum yield to the phosphorescence quantum yield through the rate constants and state concentrations.

3. Importance of Quantum Yield Calculation

Details: Accurate quantum yield calculations are essential for understanding photophysical processes, designing luminescent materials, and optimizing light-emitting devices.

4. Using the Calculator

Tips: Enter all required parameters with appropriate units. Ensure all rate constants and concentrations are positive values.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical range for fluorescence quantum yield?
A: Most fluorophores have quantum yields between 0.1 and 1.0, with 1.0 representing perfect efficiency.

Q2: How do I measure the singlet state concentration?
A: This is typically determined experimentally using absorption spectroscopy or calculated from excitation parameters.

Q3: What affects the phosphorescence rate constant?
A: The rate constant depends on the molecule's structure, temperature, and environment (solvent, matrix, etc.).

Q4: Can the quantum yield be greater than 1?
A: Normally no, but in some cases of multiple exciton generation, apparent yields >1 can be observed.

Q5: How does temperature affect these calculations?
A: Temperature can significantly impact rate constants and state populations, so measurements should be temperature-controlled.