Light Emitting Devices, organic and novel Message Board

STOCKTALK

We've detected that you're using an ad content blocking browser plug-in or feature. Ads provide a critical source of revenue to the continued operation of Silicon Investor. We ask that you disable ad blocking while on Silicon Investor in the best interests of our community. If you are not using an ad blocker but are still receiving this message, make sure your browser's tracking protection is set to the 'standard' level.

Technology Stocks : Light Emitting Devices, organic and novel

Public Reply Prvt Reply Mark as Last Read File

Previous 10 Next 10 Previous Next

To: John Finley who wrote (161)	9/8/2000 2:42:49 PM
From: kinkblot	Read Replies (2) of 330

IEEE Spectrum Aug00: The dawn of organic electronics spectrum.ieee.org {archived for how long, I do not know} Review article; some physics, device structures; references. One section describes how OLEDs work by recombination of bound electron-hole pairs, resulting in photon emission: ... There are two types of excitons formed, called singlets and triplets. On average one singlet and three triplets are formed for each four electron-hole pairs injected into the exciton formation region of the OLED. Quantum mechanics allows de-excitation (or recombination) of the singlet within a few nanoseconds of formation. This leads to a photon emission and is called fluorescence. Recombination of the triplet exciton is slow (taking about 1 ms to 1 second) and when it does occur, usually results in heat rather than light. But If a heavy-metal atom such as iridium or platinum is placed in an otherwise organic molecule, the characteristics of singlet and triplet excitons mix, speeding the emission of light to within 100 ns-100 µs. This kind of emission is called phosphorescence. WT

Report TOU Violation

Share This Post

Public Reply Prvt Reply Mark as Last Read File

Previous 10 Next 10 Previous Next