Nowadays, organic light-emitting diodes (OLEDs) have potential to disrupt the conventional and mainstream solid state lights (SSLs) and flat panel displays (FPDs) due to their numerous superlative characteristics like sunlight style color-temperature tunability, energy saving, environmental-friendly, physiologically-and psychologically-friendly, and a very high color rendering index (CRI) etc. However, the commercial viability of OLEDs would strongly depend on its extrinsic and intrinsic lifetime because OELD efficacy and lifetime greatly suffers from exposure to atmospheric oxidants (moisture and oxygen). The effect of oxydants can be minimized by use of abundant emerging encapsulation techniques while the intrinsic lifetime can be improved by a balanced device structure and high glass transition temperature based materials etc.