Organic polysilanes are promising for the compatibility to Si-Electronics, low cost due to wet process and low environmental disturbance etc. They have excitonic light emission with high internal quantum efficiency at near-ultraviolet region, and organic electroluminescence (EL) devices at visible (R, G, and B) region have been realized by dye-doping. Its stable EL, however, was limited under low temperature beforehand, since polysilane molecules tend to degrade rather rapidly due to oxidation especially under UV light irradiation. In this report, we have observed a relatively stable EL from unsealed poly[methylphenylsilane] (PMPS) /TPB device at room temperature in an ambient atmosphere. The improvement was attributed to the progress in fabrication process such as substrate cleansing, controlling film thickness, etc. and also the addition of a hole transport layer (PEDOT:PSS). The sealing with cover-glass, moreover, increased intensity of both photoluminescence and EL. Further improvement in the sealing technology and the device structure yields wider possibility of polysilane-based EL devices.%有機ポリシランはSi電子技術との適合性，対環境性に優れ，かつ塗布プロセスで安価などさまざまな利点がある.これまで紫外域に高い励起子発光効率を持つポリシランにR,G,B領域色素をドープした有機ELが実現されてきたが，ポリシランは紫外線照射に伴う酸化により劣化しやすく，安定なELは真空低温下に限定されていた.本報告では，基板洗浄や，膜厚の制御などの作製工程の工夫を行い，さらにホール輸送層（PEDOT：PSS）を用いることによって未封止の状態において常温大気中で比較的安定なPoly［methylphenylsilane］（PMPS）のELを実現することができた.また，カバーガラスで封止することによって，PL，EL強度共に増加することを示した.さらなる封止や素子構造の改善によってポリシランを用いた有機El.素子の可能性が広がることが期待できる.
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